Your team doesn't look bad, but I don't think it wins the league. Peavy, Perez, Buehrle and Radke should all deliver anf hopefully Bronson Arroyo does too. The problem is you lack depth at both hitting and pitching. IF one guy goes down, you're sunk, especially in the pitching department. See if you can get another SS and another hitter just for depth and go for another pitcher as well, either anoth SP or a reliver who will get saves (again, just for the depth).