I play Black Ops often (xbox gamertag Tekmon) and I personally have been starting to use the following for most situations as I play Hardcore mode all the time.
AK47-silencer-red dot sighting
Frag Grenade
Claymore
Decoys
Ghost Pro
Warlord Pro
Ninja Pro
Killstreaks:
RC-XD
Assault Chopper
Chopper Gunner
I found my K/D ratio shot up as the AK47 was far more accurate than the Famas I previously used. What do you all run with?