I also think the 2004 version of ESB is the best of them all. Aside from the Emperors dialogue change, the DVD looks fantastic in general and the CGI shit works well enough. Don't get me wrong, I still love the OT version just as much tho. I can watch either and not really complain about missing or added things really.

As for canon....the OT only. The PT just got too many things wrong over the things it did right and it simply has too many things that don't fit the SW universe. The PT, as stated before and 10,000 before that, will not stand the test of time. The only PT movie I watch more than others is TPM but only because I have fond memories of it, the pod race is hella cool, Darth Maul is awesome despite him being totally unnecassary, and the CGI simply looks more integrated on film. AOTC is just so poorly edited, the CG blows mules, and the story just can't hold my interest. ROTS has the sorry ass "turn" scene (a pivitol moment in the saga just raped of all emotion an integrity), the NOOO, Padme dying, Grievous (tho bad ass....not needed...as everyone knows again).... the list goes on til the apocalypse happens.

So basically....I'll watch the PT but I only enjoy it well making fun of Christiansen, the CG, and the shitty dialogue and acting. I watch the OT over and over because I always notice something new (don't care enough to try it on the PT) and I can get into it because it's just that much more real.

BTW, I like Shadows of the Empire in all it's forms (book, game, score) and seeing as how it's the biggest EU official canon, I guess i'll put that down.

PS....i so sincerely wish they'd left Jango and Boba out of the PT as they are shown because I enjoy the "Tales..." and bounty hunter trilogy account of him soooo much more. I always think of them before the PT versions when I see him in the OT.

EDIT: I missed the part where it said movies....my bad.....my opinion still stands tho.