I think Barton simply because at his age his discipline is inctredible. He has developed some power, likely will be hitting 20 HRs in the majors. His contact/walk/and average all amaze me and I think will slightly outdo Quentin...Ramirez is not even close to those 2.
Sean Tracey has my apologies, we all know Ozzie Guillen is an idiot. I'm rooting for you!