I have an idea to throw in here, and maybe it's been discussed before, don't know if it has...
I think it would be interesting to see TPM and AotC edited into one movie, making it episode I. Then have episode II be "The Clone Wars" and all be made up entirely of edited-together episodes of the animated '03-'05 microseries and the CG movie/series. Then episode III would be a re-edit of RotS with a better, tragic and less tied-up ending. Just stick to the main story points and there could be 3 decent, painless, 2+ hour-long action packed movies somewhere in there.