Classes

i like intervention with FMJ
.44 magnum with Akimbo

perk 1. sleight of hand
perk 2. stoppingpower
perk 3. steady aim

killstreaks
harier
chopper
nuke

Since I have 8 classes available (5th prestige) i'll post my basic classes

Basic assault:
Primary: ACR/TAR21 FMJ
Secondary: G18 Akimbo/Spas12 FMJ
Equipment: Throwing Knife/Claymore
Special Grenade: Flashbangs
Perk1: Marathon pro
Perk2: Stopping power
Perk3: Commando pro

Basic urban class (Small maps)
Primary: UMP45 silenced/MP5K silenced (should try it o.o)
Secondary: G18 Akimbo/AA12 Foregrip
Equipment: Throwing knife
Special grenade: Flashbangs
Perk1: Marathon pro
Perk2: Cold Blooded Pro
Perk3: Commando Pro

Basic Sniper:
Primary: Intervention FMJ/M21 EBR thermal (only on hardcore)
Secondary: G18 Akimbo
Equipment: Claymore/Frags
Special grenade: Flashbangs
Perk1: Sleight of hand pro
Perk2: Stopping power pro
Perk3: Steady AIM

Shield class:
Primary: Shield
Secondary: Desert eagle akimbo/M9 with combat knife (I use pistols because you can switch to secondary faster)
Equipment: Throwing knife
Special grenades: flash
Perk1: marathon pro
Perk2: stopping power
Perk3: commando pro

that's all