I suppose my prefered bonus version would be a HD restoration. Something as close to the '77 original release as possible. A complication is the medium. 1080 HD sets produce a picture quality all their own. There's a "crispness" to it, IMHO, that I expect would be difficult to work with. But, as near as possible.
I could live with a good SD restoration. The GOUT with good color correction (especially on ANH and ROTJ.) Thing is, SW in bargain matinees and dollar theaters with imperfect focus, mono speakers and a well worn print was an important part of my '77 experience. 480 presentation can't reproduce that exactly, but it can recreate the the sense of the era. If it came down to what would fit on a disc and or control over what is considered the primary version, I could be sold on SD.
We're getting so close to home 3D. I'd like to see a stop-gap set with HD restorations + HD alternate and deleted scenes, DVD SD restorations (BR on one side DVD on the other?), and loads and loads of DVD bonus docs and extras. A Collectors Set. Then, an "Official and Authorized" 3D+2D fan-edit set of the SW6 saga. :)