My shortlist of directors I like, and would like to see directing Harry Potter - Yes, I know most would be unsuitable, and some are even dead, but still I'd love to see what the last three would be like under their direction.
Stanley Kubrick and Alfred Hitchcock!!!!
Though I guess if I had to really pick someone for the job it might be Peter Jackson. He would do an excellent job in my opinion and he has an excellent track record. Now then there is Spielberg - great, absolutely great in the right circumstances, but I don't think him and Harry Potter would jell to well.
Other then that? I would love to see what Sofia Coppola would do, but it probably wouldn't work for most people.
George Lucas? I wouldn't trust him near a camera any more. When he works, he works great, when he doesn't we get the Phantom Menace.
Peter Weir? Brilliant director, never really done anything like Harry Potter, but good at making movies literate, poetic, powerful, artful. Produced a great book adaption with Master and Commander.
Jim Henson? The Dark Crystal was one of my favorite films when little, made quality kids entertainment in his day. R.I.P.
Robert Zemeckis? Who Framed Roger Rabbit and the Back to the Future series - that's a pretty good pedigree, and I wonder what he's doing know... Suitable in a way. Kind of.
Ridley Scott? Good at most of what he does, made some of the best sci-fi around - and fantasy is just sci-fi without lasers and bolts (I love that quote) - Probably more of an mature director though.
Akira Kurosawa? I'd like to see how it would be with Eastern structure. Good director, very epic.
Orson Welles? It would be fascinating I think, though Harry Potter would be far beneath his skills. But thematically? Yes, fascinating is the word.
Mel Brooks? What can I say, I have a soft spot for the old boy. Maybe he could do a Harry Potter parody.
And Michael Moore can do the making of documentary.
And as much as I like Quentin Tarantino, I wouldn't let him anywhere near the last three movies, even in a fantasy like this.