DJ, your post implied that you were putting the 35mm stereo mix on the DVD twice (you listed "77 stereo" and "35mm stereo" seperately). msycamore was confused by this and assumed that when you said "35mm stereo," you meant "85 stereo."

The only difference I know of between the 77 and 85 stereo is, as msycamore said, 3PO's tractor beam line from the mono mix, which isn't in any other version until 1997. I feel like there are a couple other differences, but I don't know for sure.

Honestly, I'd agree with msycamore - drop the 85 stereo and 93 stereo, and just include the theatrical mixes (77 stereo and 77 mono) and hairy_hen's 5.1 track (in ANH's case, a recreation of the 77 six-track 70mm).