Here's a review of our minor league prospects from MinorLeagueBall.com(our SBNation site about the Minor leagues).  Note, the list isn't up to date, but the reviews about the list are. Here is the top 5... if you want to see the entire top 20, you can do so here.

1) Troy Patton, LHP, Grade B+
     Traded to Baltimore. Torn labrum, out for year.
2) J.R. Towles, C, Grade B 
     Lost job after .143/.255/.264 performance for Houston. Hitting .287/.361/.575 for Triple-A Round Rock. Will get more chances.
3) Felipe Paulino, RHP, Grade B
     Out with a pinched nerve in his throwing arm.
4) Bud Norris, RHP, Grade B-
     3.48 ERA with 60/17 K/BB in 54 innings for Double-A Corpus Cristi, 55 hits allowed. Fine command with a good K/IP, interesting prospect.
5) Mike Costanzo, 3B, Grade B-
     Traded to Baltimore. .258/.330/.393 with 10 homers, 128 strikeouts in 103 games in Triple-A. Not enough power to get away with that strikeout rate.