I would dump/trade Calero for a BJ Ryan or a Mahay. Calero is good but too good for Shea. Or if you can get him, Wagner is lights out, with Guardado not too far behind.
Dessens, Halladay and Westbrook are not good pitchers for Shea. Escobar is a good rev. RH, and a bit cheaper is Trachsel. Haren is servicable as well...
When I have more time, I look at your hitters.