you said you want to preserve the old Official released in DVD format.
You list
the original trilogy when it first came out(not real good quality but want to preserve anyway) Is this the 1986 versions or the 1992 versions?
the faces THX trilogy set 1995
the definitive collection 1993
the FIRST special edition set 1997
This seems like a great idea, although one of the versions plugged on this site is a pretty faithful represetation of the Definitive Collection. I don't remember which one. While the various releases are going to be cool to preserve, what I think will make a great set is preserving the extra junk that came along with each of those versions. For instance, the 1995 Faces release would need the Leonard Maltin interviews on there as well as menu pages reflecting the Faces stylings. One of the early versions (1986?) had a small montage about "Star Wars: The First Ten Years".
And of course, covers matching the disc or tape covers are a must (and one of my projects on the side, I have a small number at Grisan's page).