What weapon should i get?

I've already got a K-2 which is long range, powerful and accurate and a sniper rifle so now I'M LOOKING FOR SOMETHING WHICH:

-Is good at close range:
-easy to handle
-low recoil so is accurate at close range
-fires really fast so I can get lots of damage done in a short space of time

Something like a sub machine gun, I was thinking one of these:
-MP7
-P90
-UZI
Remember, it doesn't have to be powerful or accurate, just the things above. PLS TELL ME WHAT YOU THINK I SHOULD GET!
IT ALSO HAS TO BE SOMETHING THAT A STAFF SARGENT 1 CAN BUY