M always using:
Sleight of hand
On the go ( most people think its useless, but if you are the kind to go for the objectives in domination ( like me ), its realy useful )
Dead silence ( like in bo2, you can hear the enemies even if they are across the map if you dont have dead silence

)
Off the grid ( since i played cod for the first time, im always using the assassin perk. There is too many uavs/sat coms in a game. )
Dead eye ( op )
There is many more useful perks, but im always using this loadout.