Mw2 Classes

I would love to know what classes you guys are good at, i just can't come to a conclusion myself on what class i should use!
thx

Class:
ACR - Silencer
Rafrica - Silencer
Semtex
Concussions
Scavenger pro
Stopping power pro
Ninja pro
Final stand
For Support:
UAV, CUAV , Harrier
For killing:
Harrier, pawelow, chopper gunner/AC130
For tactical nuke:Harrier/pawelow, chopper gunner/AC130 and Tactical Nuke

You rather use Assault-Automatic weapons or Sniper-Bolt like guns? My favorite classes are:

Primary: UMP.45 with FMJ (or Silencer if you want high killstreaks-stealth)
Secondary: Stinger to get that little chopper that prevents your team from winning
Lethal: Claymores
Grenade: Stuns, faster to throw
Perks:
Sleight of Hand (or Scavenger for high killstreaks)
Stopping Power (or Cold-Blooded for stealthiness)
Ninja

and

Primary: Intervention w/ FMJ
Secondary: Raffica Akimbo or Deagle FMJ
Lethal: Throwing Knife
Grenade: Stuns
Perks:
Sleight of Hand
Stopping Power
Commando

About killstreaks, I usually go UAV-CUAV-Emergency for map awareness or the Harrier-Chopper-Nuke for Atomic Blast