Originally Posted by Doball Jr

Assault:
Frag x3
Stopping Power
Deep Impact

SMG:
Bomb Squad
UAV Jammer
Dead Silence

LMG:
Special Grenade x3
Juggernaut
Extreme Conditioning

Shotgun:
C4 x2 Or Claymore x2 Or RPG x2
Sonic Boom Or Juggernaut
Extreme Conditioning

Sniper:
Claymore x2
Stopping Power
Dead Silence

Those should work fine, and with the SMG class, make SURE your weapon is silenced, or else, the perks won't work properly.