Very nice squad, I like it alot. Looking down the list it's almost as though there's very little you should and could do, it's such a deep, stacked team. Personally I'd hold off on any moves cause with that team you should cruise into the playoffs. However, if there is a move to be made I have to agree with the others: the middle infield could use some work. Maybe one of Bedard/Greinke/Escobar and either Boone or Reyes for a big-time replacement...I'd personally go the Reyes route, better chance at upgrading. Kent, Roberts, Figgins and Barmes are all too high right now, you wouldn't get a fair shake.
That said, if you're picking up a middle infielder try and get some SB's out of the deal, especially if you're losing Reyes. You could use some.