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Slotting can vary widely depending on how you play your character and your preferences. You didn't explain if you mostly solo, small team or large team. Do you want to aim for Recharge or Defense?

For an Ill/Storm, I feel the best things to slot for are Recharge and Endurance Recovery. Defense isn't needed as much, thanks to PA and Phantasm's Decoy drawing a lot of the aggro, plus the -ToHit in Hurricane (depending on how much you use it).

Spectral Wounds: The Decimation set for Recharge. If you want Recovery and Recharge, you can have a mix of Thunderstrike and Devastaton.

Gale: Who cares? I rarely use it, but have an Accuracy in the default slot. If you use it somewhat often, a second Accuracy is strongly recommended.

Blind: Several options -- for solo, you mostly want to slot for damage, Recharge and Accuracy. For Teams, you may want some Hold Duration. My guide gives some options here.

Snow Storm: EndRdx mostly. Maybe a couple of Tempered Readiness (slow) for the 1.5% Recovery.

Superior Invis: You want to look for a lot of EndRdx. Can slot Defense sets here, so folks looking for Recharge often slot 1 Luck of the Gambler +Recharge here, and if you have the slots, you can add 5 Red Fortune for a little more Recharge.

Freezing Rain: You want to enhance it for Recharge, to have it available as much as possible. If looking for sets, there are a few options -- some damage procs, the Achilles Tendon Resistance Debuff proc. Look also at 5 Lady Grey and a Recharge to cap Recharge.

Phantom Army: 6-slot with 4 Expediant Reinforcement, leaving out the Dam/End and the Resistance proc for the two triples from Call to Arms. At 50, you can replace those two Call to Arms with the Dam/Rech and Chance for Build Up from Sovereign Rights.

Hurricane: I like 4 from the Dark Watcher set, focusing on ToHit Debuff and EndRdx.

Deceive: I like to take it earlier. Do NOT put a damage proc in here, as it will mess up the "no aggro" aspect of the power. Leveling up, you can frankenslot with Acc/Confuse/Rech. 5 Malaise Illusions, or at 50 put in 5 of the purple set, which is one of the more affordable sets.

Spectral Terror: It does fine with just a Recharge in the default slot, but some Accuracy doesn't hurt. Only slot this up if you plan to put 5 from the Ghost of the Abyss set in it to maximize Recharge. Otherwise 1-3 slots is plenty. I think I have an Acc/Rech and the damage proc on my Ill/Storm.

Thunderclap: I have mixed feelings about this power on my Ill/Storm. I am considering switching and taking Flash instead. Illusion doesn't have another Stun power to stack with this, so it only affects minions. If you want to devote the slots, 5 Stupify + a Recharge for the proc is good. The Purple set is better.

O2 Boost: If you have the slots to spare (I didn't), 5 Doctored Wounds gives a Recharge bonus. Otherwise, 2 Miracle gives a Recovery bonus, and 2 Numina's gives some Regen.

Phantasm: Phanty is a big part of your damage, so you want to slot him for Max damage and some accuracy. Leveling up, I usually go for Acc/Dam and Dam from Blood Mandate, Acc/Dam and Acc/Dam/End from Brilliant Leadership. If you want Recharge, you can go with the same slotting as Phantom Army (except you can't slot more than one of the purple set).

Tornado: Damage and Rech. It is autohit, so Accuracy doesn't matter. Another place for 4 Expediant Reinforcement, 2 Call to Arms.

Lightning Storm: Damage and Recharge, a little Accuracy and some EndRdx if you can. Lot of options here, but I really, really like the Devastation Chance for Hold proc in this power. I think I have Dam/Rech and Dam/Rech/EndRdx from Entropic Chaos and Thunderstrike, and then Dam/Rech and Chance for Hold from Devastation. You could use 5 Decimations for Recharge.

Recall Friend: If you are looking for a Recharge build, you might replace this with Combat Jumping and slot it with a Luck of the Gambler Recharge.

On APP sets: Fireball is great, but I find that I use the Single-target blast a lot more. Consider moving Fire Blast to 41 or 44. On my Ill/Storm, I went with the Ice APP. Storm lacks both a self-heal and a self-Recovery, and Hibernate gives both. The Ice Blast is very good, and then you can take two AoE damage powers -- Illusion lacks AoE damage. Plus, Ice Shield is another place for a Luck of the Gambler Recharge.

Yeah, Plant/Storm is a great combo. Plant control is particularly good for AoE control and damage over time with Seeds of Confusion and Roots, and then Carrion Creepers added. It is weak on single-target damage. But Tornado and Lighting Storm can add some nice single-target damage. Roots has -Knockback, making Tornado more effective as a damage power.

Yes, you can farm with a Plant/Storm. I'm not sure how it compares to other builds, as I'm not a farmer. But Plant Control is great, and Storm is great, and there are quite a few synergy aspects to the two sets. Seeds of Confusion+Roots+Freezing Rain adds up to lots of AoE damage as early as level 16.

Didn't read all the posts . . . I have a level 35 Mind/FF, which I have solo'ed about 85% of the time. My reasoning for the combo is this: Mind Control is such a strong primary that it really doesn't need much from the secondary. Force Field, as a secondary, provides a few very useful things -- a great "panic button" power available from level 1, partial mez protection and some self-defense from Dispersion Bubble, and two simple powers that would make me welcome on any team. Since so many of the FF powers are not "manditory," it left me plenty of room in the build to take all the Mind powers and a few other goodies, or I could play around with the other FF powers.

Mind has 5 AoE controls, (well, really 6 if you include Telekinesis) so it can handle groups easily. It provides decent single-target damage in the attack chain of Dom-Mez-Lev. It allows me to take foes out of the fight with Confuse until I have time to wipe them out with my attack chain. The AoE damage is weak, with only Terrify and no pet. While Mind solo'ed very well in low levels, better than most controllers, its damage seems to level out in higher levels just when other controllers are picking up more damage from their pets.

Solo, the mez protection is wonderful -- I need to keep a few Break Frees handy for sleeps, but don't have to worry about most other mez issues. On teams, I can bubble the team, and then focus on using my controls in just the right way.

I have enjoyed the character, and plan to continue to level him up as I have time. I tend to focus more on "control" than buffing/debuffing, so I just don't think of the secondary first. I think of "what secondary will make the Mind primary better or more interesting." I don't think of an FF/* Defenders being comparable to a */FF controller. The defense numbers don't matter nearly as much when most or all of the foes are controlled.

"Area Man causes confused and weakened villains to see things and defeat themselves!" (My Ill/Rad is actually named "Area Man.")

"Hero duo of Captain Fantastic and the Brown Dirt Cowboy capture foes with glowing Fire and Brimstone" (Capt. Fantastic is Fire/Rad, Brown Dirt Cowboy is Earth/Rad. The names come from an old Elton John song.)

I figured I would take your slotting and make a few suggestions on how to tweak it.

Block of Ice: Your slotting here doesn't have much direction. Are you going mainly for Hold or Damage? I personally believe that Damage enhancements add more damage to a single-target hold than a damage proc. There are a lot of options for slotting this power. If you want Recharge (at a reasonable cost), then 4 Basilisk Gaze + some additional buffing if you want hold, or 5 Decimations + a common Hold if you are looking for damage. (Since you are spending the Infl for those Luck of the Gambler Recharge IOs, I'm guessing you want Recharge.) If you are looking for AoE and Ranged Defense, then 6 Lockdowns would work. If you want both Damage and Hold, at the cost of some set bonuses, then use Hami-O's -- 1 Acc/Dam, 2 Dam/Mez, 1 Acc/Mez, 2 common Recharge IOs.

Chilblain: It starts with enhanced accuracy. You could probably take that Trap of the Hunter out of there, and frankenslot two Acc/Dam and two Damage. You don't really need to enhance the Immob or Rech. That gives you a slot for somewhere else.

Arctic Air: Consider EndRdx/Confuse, Confuse and the Contagious Confusion proc from Coercive Persuasion, plus EndRdx/Confuse and the Psi Damage Proc from Malaise and a common EndRdx. That caps Confuse and EndRdx, plus gives you the Contagious proc and a damage proc. I have this slotting on my Ice/Storm, and find it very effective.

Artic Fog: Replace that Reactive Armor Endurance with an Impervium Armor Resistance. The End Recovery buff offsets the small increase in Endurance cost, but you get better resistance.

There are a lot of options for Sleet. Here's one to consider to get you some Regen and Recovery -- DefDebuff/Rech, DefDebuff/EndRdx/Rech, Rech/EndRdx and Chance for Neg Damage from Lady Grey, common Rech and the Achilles Heal proc. If you want to give up the damage proc for more Defense Debuff, replace the damage proc with a Defense Debuff from Lady Grey. But you would lose the Slow -- but that is only run speed and has no effect on -Recharge. You have other options to keep them in the area, like Snow Storm or Ice Slick. Personally, I would try to fit Frostbite into the build, but you can live without it.

The problem I have with this kind of build is that you gut the effectiveness of your powers just for the sake of getting perma-PA. If you want to give up the benefits of several of your other powers for the sake of Recharge, that is your business, of course.

Blind: The Sleep is nearly worthless. This power should be slotted for Hold and/or damage. My Ill/Rad guide explains the limited benefit of the sleep.

Superior Invis: without some EndRdx, it will be pretty tough to run this power and do anything else. It is a hog on endurance.

Freezing Rain does almost no damage, so slotting it for damage is a waste. It needs Recharge and maybe Defense Debuff.

Steamy Mist: It should be slotted for Damage Resistance and EndRdx. Much of the power's benefit is wasted without it.

Tornado is mostly a damage power. The Stun has limited benefit.

Lightning Storm needs slotting for Damage and Recharge -- and its knockback does not need slotting. (That set could be used in Gale.)

Hurricane should be slotted for ToHit Debuff and EndRdx.

Grant Invis is a complete waste when you have Group Invis. Why not take Combat Jumping instead?

There is a real difference in playstyles -- I use Hurricane in only limited situations. I find that running Hurricane a lot often tends to irritate melee characters to have their targets blown all over the place. (I know that when I am on a melee character, I HATE teaming with someone who uses perma-'Cane!) Obviously, the tactics change depending upon the team, but most of the time, I run with a good tank. Solo, I use Hurricane a lot more. But most of my advice is not base upon a level 50 character who is fully IO'ed out. I think that giving advice to someone new with a character should be based upon leveling the character up rather than a fully IO'ed and proc'ed character.

On my Ice/Storm, I run Steamy Mist and Arctic Air all the time. Once the tank grabs aggro, I cast Ice Slick and then run in with AA. Ice Slick allows enough time for AA's effects to mitigate about 70-80% of the melee attacks on the melee characters, which is plenty -- their armors can easily handle the rest. While I stand there, using AA and Freezing Rain as my main area control, I contribute holds and damage with Block of Ice and Chilblain (slotted for damage).

On my Earth/Storm, I stay back and used ranged controls, running in only to cast Lightning Storm in later levels. Hurricane becomes mostly used to protect the squishier teammates, and to push foes into the location targetted AoEs.

On Ice Slick vs. Frostbite: It is simple -- don't use Frostbite on Ice Slick. No problem. I'm not concerned with AoE containment, since I really don't worry much about doing damage on my Ice/Storm on teams. I didn't even pick up Frostbite until level 30, as I mainly wanted it for its -knockback with Tornado.

First, if your partner is a Spines/Dark, you may want to consider a set with Resistance shields instead of Defense. This would include Thermal and Sonic. These will stack with Dark Armor's Resistance.

But if you really want a Mind/FF, here's a build based upon my own personal preferences. I picked the Primal APP set entirely for Power Boost. Power Boosted Mass Confusion is sweet. I picked Air Sup over Hover because I like the protection that Air Sup provides.

Hero Plan by Mids' Hero Designer 1.601
http://www.cohplanner.com/

Click this DataLink to open the build!

Mind-FF with Fly: Level 50 Technology Controller
Primary Power Set: Mind Control
Secondary Power Set: Force Field
Power Pool: Flight
Power Pool: Fitness
Power Pool: Medicine
Ancillary Pool: Primal Forces Mastery

Hero Profile:
Level 1: Mesmerize -- Acc-I(A), Dmg-I(3), Dmg-I(7), Dmg-I(17), RechRdx-I(40)
Level 1: Personal Force Field -- DefBuff-I(A)
Level 2: Dominate -- Acc-I(A), Hold-I(3), RechRdx-I(7), Dmg-I(19), Acc-I(37), Dmg-I(42)
Level 4: Levitate -- Acc-I(A), Acc-I(5), Dmg-I(5), Dmg-I(17), Dmg-I(19), RechRdx-I(43)
Level 6: Deflection Shield -- DefBuff-I(A), DefBuff-I(9), DefBuff-I(13), EndRdx-I(46)
Level 8: Mass Hypnosis -- Acc-I(A), Acc-I(9), Sleep-I(11), RechRdx-I(37), Sleep-I(39), RechRdx-I(43)
Level 10: Confuse -- Acc-I(A), Conf-I(11), RechRdx-I(15), RechRdx-I(39), Acc-I(43)
Level 12: Air Superiority -- Acc-I(A), Acc-I(13)
Level 14: Fly -- Flight-I(A), Flight-I(15)
Level 16: Swift -- Run-I(A)
Level 18: Health -- Heal-I(A)
Level 20: Stamina -- EndMod-I(A), EndMod-I(21), EndMod-I(21)
Level 22: Dispersion Bubble -- DefBuff-I(A), EndRdx-I(23), DefBuff-I(23), DefBuff-I(37)
Level 24: Insulation Shield -- DefBuff-I(A), DefBuff-I(25), DefBuff-I(25), EndRdx-I(46)
Level 26: Terrify -- Acc-I(A), Dmg-I(27), Dmg-I(27), Dmg-I(29), Range-I(31), Fear-I(34)
Level 28: Total Domination -- Acc-I(A), Acc-I(29), Hold-I(40), Hold-I(40), RechRdx-I(48)
Level 30: Aid Other -- Heal-I(A), Heal-I(31), Heal-I(31)
Level 32: Mass Confusion -- Acc-I(A), Acc-I(33), Conf-I(33), RechRdx-I(33), RechRdx-I(34), Conf-I(34)
Level 35: Aid Self -- Heal-I(A), Heal-I(36), Heal-I(36), RechRdx-I(36)
Level 38: Force Bubble -- EndRdx-I(A), EndRdx-I(39)
Level 41: Conserve Power -- RechRdx-I(A), RechRdx-I(42), RechRdx-I(42)
Level 44: Energy Torrent -- Acc-I(A), Dmg-I(45), Dmg-I(45), Dmg-I(45), Acc-I(46)
Level 47: Power Boost -- RechRdx-I(A), RechRdx-I(48), RechRdx-I(48)
Level 49: Repulsion Bomb -- Acc-I(A), Dmg-I(50), Dmg-I(50), Dmg-I(50)
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Level 1: Brawl -- Acc-I(A)
Level 1: Sprint -- EndRdx-I(A)
Level 2: Rest -- RechRdx-I(A)
Level 1: Containment