Silenced UMP.45
Stinger

Marathon Pro
Cold Blooded Pro
Ninja Pro

This is a beast of a class. The UMP is WAY stronger than you'd think, kills in 3 shots from anywhere on the map without Stopping Power.

You're fast as hell, thanks to using an SMG and constant sprinting with Marathon. You can flank the other team in no time at all, and tear them up 1-by-1 once you get there.

Between Cold Blooded, the Silencer, and Ninja Pro, you're essentially a ghost. UAVs, Sentry Guns, Choppers/Harriers, Predators, AC130s...NOTHING sees you. You're free to blast every enemy chopper/plane out of the sky, because they're never aiming at you. Great help to the team.

Ninja Pro not only screws with the Heartbeat-Sensing campers, but the silent footsteps thing is HUGE. When you run into a room of 3 bitches sniping out a window, you actually get to kill the first 2 without #3 knowing what's up.

I switch back and forth between Claymores (1 or 2 kills a match) and C4, depending on the map. C4 is fun on Wasteland, enemies tend to group together in the trenches.