none said:

How about Mr. Morgan's ESB 70mm in theater recording: http://www.wideanglecloseup.com/starwarsaudio.html (scroll down)

OT.com thread: http://originaltrilogy.com/forum/topic.cfm/ESB-70mm-Soundtrack-1980-in-theatre-recording/topic/12501/page/1/

I second this.

Using a High(ish) Quality audio would be totally out of place. Imagine if you had a missing section of video and replaced it with 2004 DVD or 2011 Blu Ray footage? It would be out of place...

My second choice would be the DJ V3 theatrical stereo and third would be the Definitive Collection commentary track as seen on the Dr Gonzo DVD.

Going off at a complete tangent, how about an isolated score like the one on the DJ V3.

I have highlighted some of the different dialogue differences here...

http://originaltrilogy.com/forum/topic.cfm/The-Definitive-tractor-beam-Close-the-blast-doors-Blast-it-Biggs-Wedge-you-dont-taste-very-good-Noooooo-Preservation-Guide/topic/13428/

If there are any gaps you can help me fill in, I would appreciate it.