I vote blue Empire logo on the back.
Also, and I know I sound like a broken record here, PG on the back instead of G. The G rating simply makes no sense at all - it's inconsistent with the front, and it's inaccurate to boot.
Other than that, these may be my favorite Star Wars covers I've ever seen!
Oh, and for Jedi, I'd definitely prefer the lightsaber poster to be on the back, with the standard poster on the front, the way you had it before.