Mos def AOTC...
So many goodies. It's without a doubt the most artistically rich film of the saga...Lucas, Chiang et al at the peak of their powers...and was such a leap in film effects even by SW standards at the time...the combination of the two has made made it irresisitable for me.
No film had even come close to doing something like the scale of the Coruscant speeder chase for example...that one scene alone is more effects work than most any other film until that point would have in a whole movie...
And you catch new stuff with repeated viewings of Clones more than any of the other SW films...this is especially true with the OT films of course because of the style of films they are, the content and/or budgets.
I somehow tend to not overwatch films that I really respect. I saw the LOTR films twice each in the theatres...wouldn't want to see them again for maybe another couple years...it would ruin it...don't know how/why people do it. Next time I'll see them, they could be just as incredible as when I first saw them.
Movies like the PT movies are meant for exactly this...SW nerds staying at home and skipping to the favorite parts of their "cartoon" over and over again cause it's neat-o.