Diamond Cutter, Bang!
During his WCW peak it was the most over finisher, DDP '96-'97 got such a big reaction for it. The billed the fact that the move could be hit from virtually anywhere from out of nowhere, the finishers that can just be nailed just like that are always great which brings me on to....
.....Sweet Chin Music, the way he caught Shelton Benjamin in mid air during the Gold Rush Tournament makes it a winner anyway but its good because although there often is the tuning up the band aspect it can also be nailed when you are least expecting it.
Jake Roberts DDT, the move was special then, the short arm clothesline set-up followed by the DDT, anyone wondering how over it was only had to listen to the entire crowd chanting D-D-T! They were wise back then, to keep it special he was the only guy in the company allowed to use it, now its just another move and most don't perform it half as well....
....which brings me to Arn Anderson's Spinebuster another move which now has most people shrugging their shoulders but nobody nailed that move like Anderson, watching back old tapes its one of my favourite moves, watching Triple H do it now I have little interest, it also shows how the seemingly smallest of moves, were done were can be made to look special.
There's probably many more but those are the ones that instantly come to mind...