Alonso, Liriano & Grandal are ranked highest. The Cespedes signing tied the A's with the Padres in the most ranked players:
SD – 6
OAK - 6
M’s – 5
Tex – 5
Stl - 5
Arz – 4
Tor – 4
TB – 4
Col – 4
NYY - 4
I'm surprised Robbie Erlin didn't make the list. They ranked him #34 in their 2011 mid-season top-50, and he had an excellent end to his season.
http://www.baseballamerica.com/today/prospects/rankings/top-100-prospects/2012/2612998.html