Taking a prospect depends on whether you keep him or not. Do you keep your whole team? If so, Teixiera is an obvious pick. Here's some more:
Rocco Baldelli, OF TB
Jose Reyes, SS NYM
Hee Choi, 1b CHC
BJ Upton, SS TB
Jason Stokes, 1b FLA
Brandon Phillips, 2b/SS CLE
Upton and Stokes are a few years away, but all the others should see time this year.
If I were you, I'd strongly consider Brandon Phillips, unless he's been picked, b/c he'll be eligible at 2b this year, and when Vizquel retires, he'll be a SS. He'll be 2b/ss elible for at least a year or two. That's pretty valuable.
Zack Greinke...the next Greg Maddux. LOOK IT UP!
For what it's worth.