Nicklaus--Castle Pines (I consider Harbour Town a Pete Dye course...although CP might be slightly ahead anyway). Sycamore Hills and Desert Highlands probably fall next of what I've seen (8 cses total)
Weiskopf--Forest Highlands Canyon by a fair margin, then The Rim and Seven Canyons ahead of Double Eagle.
Haven't played that many by any of the others...
Crenshaw--Colorado GC over WKP Saguaro and Warren
Palmer--only played Tartan Fields
Watson--Spanish Bay is better than Conservatory at Hammock Beach IMO
Order (first three VERY close)
1. Castle Pines
2. Forest Highlands Canyon
3. Colorado GC
BIG GAP--nothing wrong with these last two but nowhere near the first three which are all top 100 level IMO.
4. Spanish Bay
5. Tartan Fields
Like many here I'm very impressed with Coore/Crenshaw even though I haven't seen much of their most highly regarded work. They do solid designs, although Warren and Talking Stick North weren't the most exciting properties ever.
I actually like most of what I've seen from Nicklaus as well. The courses are tough but they provide interesting challenges that seem to vary from course to course.
Weiskopf has had some amazing visual pieces to work with in Arizona, many with Jay Morrish. Forest Highlands to me is his best "design" in terms of making the golf course interesting to go along with the land. The Rim and especially Seven Canyons are so beautiful that the course itself can get a little lost if you know what I mean
Not sure that's a design flaw, Sedona is an amazing place.
Can't really comment on the other two from 1-2 courses.