Well first off just let me say I think the stakeout is terrible, mainly because I never have any luck. I know this is going to sound terrible but I just can't kill anyone with a shotgun unless its the spaz or HS10, and thats rare as it is. I always die more then usual with a shotgun.
I have to say though my all time favorite set up is with assault rifles. I love to use the galil with a silencer. Ballistic knifes as a secondary (for those quick knifes). Perks as follows Scavenger, Sleight of Hand, and Marathon. I used to use Ninja but it does absolutely nothing in black ops. I usually stay alive long enough to make good use of scavenger. Otherwise if your going to use a burst rifle definately put some flak jacket on that as it saves you on more occassions then not.