What should I "shoot for" with these builds?

Well, Fire/Rad will be spending the majority of it's time in melee range. With that in mind I would go with Stone Mastery. The whole APP is awesome for a controller.

-Fissure: An AoE that will hit as many targets as Fireball, and will deal similar damage with Containment. It also has a chance to stun, so if you drop Fire Cages and hit the mob with Fissure, you might be able to save Flashfire for the next mob if enough of them are stunned by it.

-Rock Armor: Pretty basic Smashing/Lethal defense shield. It's ugly, but if you want to shoot for significant levels of defense, it's indispensable. Many Fire/ Controllers go with Stone Mastery for this power alone, since so many of the attacks in the game have a smashing or lethal component this will defend against.

-Hurl Boulder: Same as the Stone Melee power. As a Fire/Rad controller, this will probably be the power in the APP that you skip, since a single target ranged attack isn't the most useful thing for you.

-Seismic Smash: Absolutely AWESOME power. It is an Extreme damage attack, and Mids' lists it as dealing nearly 700 points of damage with Containment and slotting. But it gets better still. It is ALSO a Mag FOUR hold, meaning it will hold a boss in one application (and it's a guaranteed hold, not a chance to hold, if it hits they're held)

-Earth's Embrace: Dull Pain clone. A huge heal and max HP boost. It can save your life if you slot it decently, and if you get enough recharge from the rest of your build, you can potentially make it perma (I think, I'm not sure if the recharge is the same as tanker/scrapper/brute/stalker Dull Pain clones. If it IS the same recharge you can have it perma with just 55% global recharge, which you should easily top)

I put together a Fire/Rad build a while back that was softcapped to S/L defense and had enough recharge that AM had maybe a 10 second downtime.

I would actually focus on Endurance reduction just as much as recharge. You really want to be able to run both Hot Feet and Choking Cloud and still use your powers. (The Chance for +2 mag hold from the Lockdown set is a godsend in Choking Cloud). Hot Feet, Choking Cloud, Radiation Infection and Enervating Field, plus your APP armor, and any other toggles you may want to run will burn a metric crapton of endurance, so if you don't focus on end reduction/recovery you're going to find your end bar running dry in any fight that lasts longer than a minute or two.

For the kat/regen you want recharge, recharge, recharge, defense, and some more recharge.

Originally Posted by Dechs Kaison See, it's gems like these that make me check Claws' post history every once in a while to make sure I haven't missed anything good lately.