Originally posted by: ShiftyEyes
So I don't really suscribe to either the two schools of thought which say there's only either the original trilogy or there's the prequel trilogy + original trilogy. I can see more configurations now. <snip!>
2. Star Wars and its great sequel, The Empire Strikes Back.

Regardless of how one feels about ROTJ, I don't think this is a valid "configuration". ESB does not have a proper ending (by design). It's the only one of the three that has a cliff-hanger ending like the old serials that GL cites as inspiration. No doubt, Star Wars is a true standalone (because GL had no idea if he'd get a chance to continue the story), but Empire must be followed up by another film.

There is another configuration you didn't mention:
The Prequel Trilogy (all by itself)
Those films are so different from the One True SW Trilogy that as far as I'm concerned they can stand by themselves.