Lately, MP5 silenced, M9 silenced, stun or frag x 3 (depending on mood), UAV, and DS. Once in a while, I'll take stopping power over UAV, but that's when I hear the dreaded "the enemies UAV is on-line!"... just as I enter a house full of them.
Maybe it's just me, but I've found the MP5 to be damned good from the hip even without steady aim.
When I'm having a good night (rare), or if I'm on a map I know well enough (some maps - like Chinatown and District - I'm just directionally challenged on for some reason) I can tear it up with that class. Other times, just so-so. But I'm always in the positive doing it.