Primary: Fire - Just pure damage and we're blasters.
Secondary: Atomic - It has most of the tools you could want. It has a single target hold. It has an AOE hold. It has some nice ST damage and a decent AOE damage power. It has an OP power (imho) in Accelerated Metabolism that is a toggle, NOT a click power....+regen, +recovery, +mez protection, +RECHARGE. It has another toggle that is FOE -DEF, -To Hit with a +recharge to you. It has the most recharge with the exception of Time Manipulation. With the extra recovery and extra recharge, it lets you deal non stop damage. AND if you trick out your build, you could get capped def to SM, LE, EN, FIRE and COLD without incarnates....which leaves Musculature & Assault Cores available for even more damage. It's a beautiful thing.
For Fun/Cool Factor: Dual Pistol / Martial Combat. Gun Fu baby!
For a Nice Surprise: Try Archery/Tactical Arrow. Decent Damage and loads of tricks.
For AVs: Anything Mental Manipulation
Dig it!