Disagree with Valhalla, which I think is actually a pretty interesting golf course. It just happened to be the course that didn't fit in 2000 with Augusta, Pebble, and TOC.
I also think Southern Hills is better than it gets credit for here. Ditto Olympia Fields, which has quite a bit of interest.
Medinah also gets a bad rap, but I'd like to know what's so different about it and Baltusrol Lower, which never makes these types of lists but is very much the same style of course. Medinah probably has more character of the two, although Baltusrol Upper might be better than either one.