Little bit confused with the deal. If you keep 8 how are you giving up a 2nd round pick? If Hamilton could stay healthy it might make me feel better about the trade. But, truthfully, in a keeper, I don't see that much difference in Felix and Pineda, I believe he is the real deal, and the difference in picks is huge, although, like I said, I don't understand the 2nd round thing.
Pineda will most likely be shut down near the end of the season, so that can hurt you in the playoffs. This trade will definitely be best if you're trying to win this year. But I would hope you could get a better pick then a 20th rounder, see if he can offer you something better then that.
I actually like the deal a lot for you. Felix and Hamilton are studs, and you do get a nice boost in your OF. If you're competing this year, I say go for it. Thanks for your help on my Lester/Gallardo question.