Some one I really want to see on PRR would be Peter Jetten. He's a great poker player and also a very funny guy, so he would be a perfect fit for the show. He has a show on Poker Static called Rootbone Radio, and if you have not seen it you should definitely check it out.
Rootbone Radio Episode 1
edit: The link I posted was being weird for me, so here's a link with a list of all the episodes:
http://www.pokerstatic.com/category/rootbone-radio/