I don't think I'd do the trade unless you are pretty certain Pedrioa will go for much more. Your $310 cap makes everyone a little more valuable than a standard mixed league and Pedrioa is priced about right and an OK enough keeper at $36 it's just that Trout at $8 is a much better option IMO. Try to work the deal for Pedrioa without losing Trout and keep both. If you can't, just pass. I'd try to package 2 decent(ish) keeps like say either Romero or Masterson packaged with Lind Yadie or Yunel.
As for other keepers, Kemp will likely go around $50 in your $310 setup and I'd keep him at $39. I'd also keep just Avila $9, Trumbo $8, your favorite two of Jaime $13,Masterson $8, or Romero $15 (I'd keep just 2 SP). Other possibilities are Yadie $12(2C league) Cutch at $36 and maybe Yunel at $11.
MVP****NL11,AL07,AL05,NL04,ALNL03,ALNL02,NL01,ALNL00,AL99,ALNL98,ALNL96 RIP Cammi
Cmon Bud, NOW is the time to sack up and force feed an Olympic style drug program down Fehr's fat throat. Save OUR game from these blatant cheaters!