Ended up going with CF Ricky "Pie Thrower" Rios.
Had a tough time deciding between him and Cox, but Rios is a bit younger so he'll have almost an extra year to develop, plus my rotation is very young and still effective. If he can develop quickly, him and Leak will make a hell of a 1-2 punch. Rios gives me insurance in case Kimpel or Maybin don't develop as hoped.