I like monster. I've had rockstar and full throttle before also but I forgot which one of them I hated and which one I loved. Such a blur...
Also vault is for wimps (not that I don't like it, but it just doesn't really count in my opinion)
Also one dude I hang out with today who is a real attention whore decided that he would down 8 doses of some energy shot that is meant to keep you awake for 26 hours or some stuff. He had an alergic reaction and is now at the hospital..