Illusion/Rad Controller - Slow going early on, but once you get Phantom Army, you will be a soloing machine! Rad gives some great debuffs, a heal, and Fallout rocks the house if you're teaming and a teammate falls during a big fight.
Dual Pistols/Martial Combat Blaster - If you like Hong Kong action flicks (and even if you don't), you will be a walking one with this. Use Ki-Push, then shoot!
Electric/Shield Stalker - You'll get just as much of a charge out of it as your enemies will!
Bots/Dark MM - End heavy, but you're a walking army with great weapons and team stealth and healing. /Dark also pairs well with Mercs and Thugs because the Medic and Arsonist quite frankly suck at staying alive (ie usually the first to die), and the Medic doesn't always heal when he should.