If you ever get a chance, watch Raphael put some stuff on the ball, he will blow your mind! I've seen him put on a demo one time and I couldn't beleive what he could do with the cb!!!
I was just thinking of touring professionals, not billiard champions or trick shot artists. Semih is definately one of the best when it comes to the stroke, I must say.
Though they are not active, George Breedlove ("The Flamethrower"), and Mike Massey are way more powerful than anyone on your list. Good, controversial topic.