I'm saying 4 - 6 then 1 -3. Granted, I HATE the first 3...but i bet your son would enjoy them because he wouldn't have the same nerdiness childhood love for the original trilogy that most of us do. Gav
Yes I agree 4,5,6 and then 1,2,3. Too many cliffhangers in 4-6 that are ruined if you watch 1-3 first ones. Especially if you know Luke is Leia's sister, Darth is daddy.. those take ya back if you see 1-3 first you know all of this before hand. :(
4-6 then 1-3 of course. Order of release ensures he gets the best/intended experience, and trying to not let him watch 1-3 is silly. He'll want to see em after he's seen the others, even if you don't tell him about them he'll know they exist, unless you keep him in a cave. :P