Also, as for Powell -- have you ever seen the Red Shoes? If not, you're in for a major treat.
I've always whined about how Criterion seems to have some very inessential films in their repertoire (Armageddon, The Darjeeling Limited) for the sole reason that I really enjoy the idea of "watching every Criterion", but feel discouraged by the fairly notable degree of chaff. Nevertheless, I think it sounds like a really interesting experience, and I look forward to hearing your thoughts. Feel free to make update posts more frequently than every few years!!