The Machrinhanish write-up is not new.
Essex and Eastward Ho! were the two that I really thought would be worth seeking out, based on the reviews.
Hard to tell about the best site, but Eastward Ho! looks like marverlous terrain.
I think one element that unites these courses is unpredictability -- the sense that the landforms yield uncertainty in the mind of the golfer, which I think in Ran's views (one shared I'm guessing by a fair number of GCA posters) is something to be praised.