Buddy Hall. I also like Scott Frost and Jeremy Jones.
John Schmidt and Earl Strickland for me. Combination of humor and top notch insight on the game.
Billy I and Jeremey Jones are good. Commentating can make a bad match great or a great match bad...for example the favoritism from Ken Schuman during the SVB vs Alex TAR match where Alex came back from a big deficit made him look like a complete mook.
I don't know his name, but he comments most of CSI production.. he also is the presenter of the players in these CSI videos.