BTW I like all the covers I've see on here so far.

Imrahi, I'd go with the speederbike back. Dynamically it's hard to decide.

As a group you have either:

Large face, facing left (ANH)

Far away faces, facing away (TESB)

Midway face, facing right (ROTJ speederbike)

The other option would be:

A villain (ANH)

Two main heroes (TESB)

Supporting characters (ROTJ C3P0)

Drew Struzan used the "Heroes", "Villains", and "Supporting Characters" theme on the Special Edition one-sheets. Nice!

Both back covers add to the green/forest theme of the front, so they're both excellent choices for ROTJ. These are honestly the best artistically crafted covers I've ever seen for Star Wars; Blu-ray or DVD.