I think your pitching is fine. Greinke's an ace, and I (and most people) still think Nolasco will turn into one this year.
You don't have anybody who screams "sell high" to me, except Wells if anyone will bite. I think you're probably stuck with Sizemore for better or worse, unless you want to trade him for Alcides Escobar or something. All in all, I think sanding pat is the way to go.
If you get a chance: viewtopic.php?f=29&t=410032