I would definitely check out the PS78 too. It's a videotape filmed one year after Star Wars was released- being one year later, the film didn't have time to fade and being a videotape, it didn't lose its color. It seems like it would be a great reference. Frank was a theater projectionist back then and he said that it matched his memory of the movie, especially the heavy bias towards blue- green....
I want to see this as untouched as possible. The more grain the better!