We know CC Sabathia will be our number one starter in 2009, but with the signing of Burnett, who becomes the number two?
I say Burnett. Assuming Joba is the fourth starter right now (to limit his innings), it would be best to break up two similar style pitchers (Burnett and Joba) in the rotation. Both are right-handed power pitchers, primarily utilizing a devastating breaking ball as their out-pitch. You don't want the opposition to see that in consecutive games, so putting Wang between them (with his contact/ground-ball repertoire) would probably benefit Joba more than if he pitched after Burnett.
What's your say?
(Of course if Pettitte returns, Joba probably gets pushed to the five spot, rendering this point moot...)