Leinart will do well. David Greene will be a lot better since his O-line is not full of freshmen and sophs this year. I don't know about Walter. He was supposed to be good last year, but I guess he didn't play well. Jason White will probably have another good year, but he won't get drafted with all his injuries.
The number 1 pick in the draft has been a QB for the last 4 years. I don't see any of the QB's in next years class going number 1. Early number 1 projection: Mike Williams.