After that I would either go for Sheets, Burnett, or Lowe depending on how much we sign Ibanez for.
If we can't get them go out and get Jake Peavy. Trade Carrasco and package a couple other guys. One or two more prospects and a seasoned MLB player should do the trick.
If we don't get any of the targeted pitchers then try putting Carrasco in the starting rotation and see if he is ready. We definately need a 5th starter and depending on what happens with Moyer a fourth and a fifth.