My classes are:
SCAR-H w/ silencer
Forgot the rocket launcher... arks up than down...
Scavenger Pro
Cold Blooded
Ninja Pro
Claymore
Flashbang x2

and the other is:
TAR-21 w/ silencer
same rocket launcher
Scavenger Pro
Cold BLooded
Ninja Pro
Claymore
Flashbang x2

and killstreaks:
Pred missle, Heli, and Pavelow

Main: TAR-21
Main Attachment: Silencer
Secondary: AA12
Secondary Attachment: Grip
Equipment: Claymore
First Perk: Scavenger
Second Perk: Hardline/Stopping Power
Third Perk: Commando

Main: SCAR-H
Main Attachment: Shotgun
Secondary: PP2000
Secondary Attachment: Preference
Equipment: Semtex
First Perk: Scavenger
Second Perk: Stopping Power
Third Perk: Commando

Main: Barrett .50 cal
Main Attachment: ACOG Scope and FMJ
Secondary: G18
Secondary Attachment: Akimbo and FMJ
Equipment: Preference
First Perk: Sleight of Hand/Scavenger
Second Perk: Hardline
Third Perk: Commando/Steady Aim

These are the classes I have had the most success with personally. The sniper class is meant to dual wield the glock 18s for most of the time and use the sniper when necessary. Not too concerned whether you use them since I hardly ever play Modern Warfare 2 anymore.

Main: UMP45
Main Attachment: Silencer
Secondary: Magnum
Secondary Attachment: Tactical Knife
Equipment: Claymore
First Perk: Marathon Pro
Second Perk: Lightweight Pro
Third Perk: Ninja Pro

Killstreaks: Carepackage, Attack Helicopter and Pave Low.

[Edited by ArchDuke, 7/1/2010 3:51:22 PM]

Sniping/Quickscope:
Intervention FMJ Blue Tiger
Akimbo M9
Sleight of Hand Pro
Stopping Power Pro
Either Ninja Pro or Steady Aim Pro

Knifing:
MP5k Silenced Blue Tiger
M9 Tac Knife
Marathon Pro
Cold-Blooded Pro
Ninja Pro

Knifing Classes Fail >.> One of the reasons I quit playing MW2 everyday is because of that bull****.