I like your list Jaimie; but what about the king of American cinema, who everybody has seemed to forget:
D.W. Griffiths !!!!
Plus, if we're going international:
Bergman!!! (chess anyone?)
Obviously, this web-site list under discussion is just ridiculous; the only one I follow is the every ten years one,Sights and Sounds, which has had Welles on top as director and Kane as film since 1962, and is voted on by industry people:)
PS: Jaimie: I think i'd like a theme park with rides based on Welles picures: these would be great rides: Shanghai (fun house), Arkadin (he keeps chasing you and telling you old european homilies) Touch of Evil ( battle it out with the Hankster) The Trial (you never know what's happening in this one) and TOSOTW (though this one would have to be rated adults only- I'm thinking of that car ride with Oja)