for future reference, you went way way too young last year. When you only keep 5 players having that many prospects kills you since you are forced to throw them all back. In this format there are only about 2-3 prospects a year who should be even considered as a keeper.
I'd personally take Cespedes, Lawrie, Butler, Johnson and Wainwright. Both pitchers are in contract years, and I'd trade them this season once they establish their value.