Guess I was sort of thinking of people generally thought of as great strikers, Silva, Serra etc, but guys like Lesnar and Carwin probably have as much one punch power as anyone.
Serra isn't thought of as a great striker. His stoppage over GSP was his very first and still only win by strikes.
Rizzo breaks Arlovski's nose with a jab and then flattens him with a right in UFC 36. He makes it look effortless. Liddell's knockout of Randleman in UFC 31 is nice.
Rizzos one of my favorite, its a shame he had such a short prime. The guy was a complete package and a devastating striker (both hands and kicks). Hes a guy you wouldnt want to face.
You can make a case for Liddell in an absolute sense, and not just p4p; most of boxings biggest punchers have been medium sized heavys, which is pretty much what Chuck is.
Wandy. Its hard to say with guys like Chuck and Wandy. They'll stun somebody and then follow it up with a flurry of clean shots.
