Get a good sniper rifle. If you get up close and personal, get an l9/l11/m200 ghillie. If you prefer accuracy and camping go for DSR-1 SubSonic/TPG-1 PRO. If you wanna rape people across the map, awsum style, get the m107.
Nuff said.
lmao m4s90 is so beast if u can aim nuff said
MP7 Mod is my fave there.
M4 Super 90 is the best freaking shotty, but you should probably get an AR unless you don't have one.
AR-L85A1 Mod, G36E Valkyrie, M416 CQB (I like the L85A1 Mod)
SG-M4 Super 90
SMG-Nothing thats good really falls into this category :P
MG-MG36
Thee M-200 Ghillie and the TPG-1 Pro are snipers. Those are 30k :P