Henry/Clint or Wade, I would say have the best voices, since they both go so well with the spoken lines of the characters, and suit the violent personalities of them both.
Nah, I don't like rough people, I like people like the preps and the non-cliques. Also, for the preps, I think Gord has the best voice, for the Jocks, nothing to say, constatinos also same for non-clique, for bullies, well, I'll go with Wade.