Originally posted by: Molly
So right now I have the 1.0 audio as reconstructed from a 1985 PAL VHS. Is this still the best available? Not for long. See this thread:
The Mono Mix Restoration Project

Originally posted by: Molly
I also have the audio from the DVD; this is the same as the 2.0 mix from 1984 and prior home videos, am I correct?

No, the bonus DVD (known around these parts as "GOUT" - George's Original Unaltered Trilogy) contains the '93 remix used on the Definitive Collection laserdiscs and "faces" LD & VHS from '95.
Belbucus, the same fellow working on the mono mix restoration, has already finished a restoration of the '77 Dolby stereo mix (the one found on pre'85 home video releases.) He's captured it from laserdisc and digitized it using professional-grade equipment, cleaned it up, and synchronized it to match the GOUT video. See this thread for details:
GOUT DVD using 'Faces' PCM sound?
In spite of it's title, that thread also contains discussion about the '85 remix as well as the '77 Dolby stereo mix.

Welcome back!