Definitely go for the Dark Jedi V3 DVDs.

Anamorphic, stabilized, cleaned-up video with a light touch on the color correction (what color correction is there is meant to bring it as close to the original '77 color timing as possible), subtitles that are designed to emulate the original theatrical subtitles (for Huttese parts in SW and Jedi), and the audio mixes for Star Wars include:

- 1977 Theatrical Stereo
- 1977 Theatrical Mono
- 1985 Stereo Remix
- 1993 Stereo Remix (the audio that's on the 2006 DVDs)

And, the kicker - and the default audio track:

- Hairy_Hen's excellent Dolby Digital 5.1 recreation of the 1977 Dolby 70mm Six-Track audio mix.

My god, does that track sound brilliant...

Empire and Jedi also have 5.1 audio made by Hairy_Hen, but they're not attempts at recreating the 70mm audio because, well, we don't have a reference source for the 70mm audio of each of those.

So yeah - I think Dark Jedi's GOUT V3 is exactly what you're looking for.