Wel I have no interest whatsoever in Orlando, so that knocks him out right away. Brad would be interesting to talk to because i like his philanthropic view of things (and in a very "six degrees" moment, did you know that both Brad Pitt & PJ both were roommates with Jason Priestley at one time or another? I'm not sure if it was at the same time though.) Paul's the guy I know though, so I always have fun hanging out with him, and would choose to do so whenever given the chance - he's got some pretty great philanthropic views of his own.
(and he's let me play with his hair before, not sure another celeb would do that, so Paul gets bonus points, lol)