If you want to play that stealth role, why not pick up an AEG? Your gun does not limit you to a style of play, per-say. (Not going to be a DMR guy when you're toting a minigun!)
That way in the event of things going south, you have the auto/full capabilities.
If you're dead set on it, then it's your call.
The CA M24 is great out of the box (so I've heard) ditto on the TM VSR-10.