FWIW, NBADraft.net has all 3 going, Wagner late 1st, Carr with the first pick of the 2nd, and KBP early in the 2nd.
I don't like the whole "improve your stock" argument. It doesn't happen any more often than your stock going down. My thought is always, first round pick, then go. You likely won't be any higher next year. Bridges and Wagner both opted to return, and both are exactly where they would have been a year ago, except now with a year less of income in their careers.