Having both Camoranesi and Santana would be very useful if Nedved gets injured because we could easily revert to 4-4-2 with Camo on the right and Santana on the left. And indeed, Gasba should be loaned to a Serie A club like Lecce or Perugia.
Gasbarroni is a brilliant prospect, but I don't think he's ready for the big time yet. If we don't get Jankulovski then Santana would be a very good left midfield option, but defenders remain our priority.
Santana would be a very nice purchase imo, but I like his idea. Let's sign him now but leave him at Chievo for one more season, possibly two, so that he would make a smooth transition into the Juve first team.