I almost have to have two sets:
New Ambers (with amber defined rather loosely, IMO):
Prada Amber PH Intense
New York Amber
All-Natural Amber: Ares (Lord's Jester)
I recommend that amberholics give the latter a sampling. After you've been jaded by a lot of normal variations on the amber theme, that one really sticks out just for it's complexity, naturalness, and smooth evolution. Try before you buy, but if you want to see what the all-naturals people are up to - and in a way that makes sense to fans of classical perfumery - that's a good place to start.