Perk 1 - Flak Jacket Pro
Perk 2 - Hardened Pro
Perk 3 - Tactical Mask Pro
If you can take the time to grind out the pro versions of these perks then you will become a walking tank - no more deaths due to claymores, nades and noobtubes thanks to Flak Jacket Pro. Get the upper hand with no flinch from Hardened Pro, as well as the ability to shoot through walls better. And Tactical Mask Pro - no deaths from stuns etc. plus you can see where people are when you stun them.
Alternatively,
Perk 1 - Scavenger Pro
Perk 2 - Warlord Pro
Perk 3 - Tactical Mask Pro
2 Lethal Grenades
2/3 Tactical Grenades
Ability to replenish both of these
Stuns etc. show you where the enemy is
Basically, just walk round with a stun in your hand, stun a room to see where the person is, grenade it then go in guns blazing and finish of the guy, then replenish all of it by picking up his scavenger bag