I have to say, as far as commentators go, there are many that do a really good job. When it comes to who I would like to listen to, I think that Justin (JCIN) may have the best all around style. I enjoy listening to his commentary. To me, it gets kind of boring listening to a guy say, "I think he's probably going two rails. Looks like he's going for the 3 ball next." Most players can figure out the paths that are going to be taken, although I do appreciate occasionally giving additional ideas, like he can play it one of three ways, etc.
I like how Justin mixes it up and throws in stories and personal accounts. He also talks about how the matches were put together and gives background to how the players ended up in the match. It adds layers to the match and storyline that would otherwise be absent. He also adds a lot of humor to a situation. When he's in the booth with someone else they usually start cracking jokes at some point.
I know you have other obligations during the match, but if you want to jump in the booth a little while Justin, I for one would not complain.
If I had to pick others, the combination of Scott Frost and Cardone from the '10 US Open 10 ball was a combination that really worked. Those two, being good friends, fed off each other and had everyone rolling.