Of the choices given, I'd probably vote for:
Offense:
O Energy Blade
O Ball and Chain *
Defense:
O Density Control
O Vibration
On a sidenote, I STILL want to see a controller "Lag" powerset, including powers like these:
Mapserved - Single Target Hold. No damage, but bypasses most defenses.
Random Disconnect - Target disappears from map for approximately 1 minute (enough time to log back in) - reappears with all toggles down.
Insufficient Ram - slows target dramatically, chance to disorient
Video Card Flux - blinds target (like smoke powers)
Server-wide ____ - AoE version of any of the above effects.
Rubber band - TPs target approximately 15 yards backwards, heals damage/effects inflicted by target for last 5 seconds.
I know the Devs will never actually do this - I sometimes think they take this game too seriously.

but it'd be a fun set, relatively easy to do (since it happens to us all the time, should be easy to set it up for the computer), and would be worth a good laugh. Maybe some of these powers could be temp powers given as christmas gifts, or inventables.