I'm not expecting too much from Santana, but he showed in the first half he could be a solid pitcher. He would be the veteran leader at the top of the rotation. He should be 100% by ST.
Gee is very solid underrated pitcher and a nice #4.
Harvey is already a beast, so I have no concerns about him. Wheeler is supposed to be better, and counting on him as your #5 takes all the pressure off.
Niese has become an excellent #3, borderline #2.