Each of us has individual tastes and criteria but these are my absolute favorite of the 20 or so large auctioneers of CAC coins considering all aspects of buying from them. All are accommodating, polite, professional, informative, reputable, knowledgable, and downright fun to deal with.
Stack's-Bowers
Heritage Auctions
Kagin's
Comments
I sorta wish Kagin would have auctions more frequently. Some of their gold coins were very nice in the past.