I think the real question is: Do we really need another starter?
I saw somewhere in a blog that our rotation is surprisingly set. If we start the season today I would say the rotation would be:
-Patterson
-Perez
-Bergmann
-Redding
-Hill (on the 13th)
The AAA rotation would be:
-Lannan
-Balester
-Chico
-Clippard
-Mock
The AAA rotation is almost better than the Major League rotation!! well not really but thats a pretty set and solid rotation. Would you rather add a starter who is similar to guys you already have? Why in the world would you want to add Jeff Weaver when you have 5 guys in AAA who could outperform him. Why would you add Horacio Ramirez when you are going to have Matt Chico who started 31 games and had a 4.67 era or John Lannan with what seems like a ton of MLB potention. Lannan started 4 games, including games in Philly and at San Fran with a Home Run Record on the line.
Seems to me that we actually have some serious depth in the SP category. What we have is a lot of #4 starters and adding another #4 starter wont make things better. If you want to add a pitcher go for a top tier guy not another slouch. We all saw how 2006 went with all #3-4 starters (Livan, Astacio, Ramon Ortiz, Armas --yuck) Lets go with what we have for another year and see how these guys develop