Jeff,
This topic was brought up last year under the title "Hidden Gems". With the new blood ingested into GCA in the last year, we should get new gems listed. John Conley put together a spreadsheet of all the gems people listed and sent them out to everyone.
My main gem (that I listed before) is Deerfield GC in Newark DE, the club formerly known as the Louviers course at DuPont CC, where I was a member from 1992-1993. Very hilly property (especially for Delaware), with a lot of fun, tough holes. Awkward dogleg on par 5 1st hole was oly drawback. That, and the big need for a chainsaw, especially on holes 5, 9, and 10. A local rag listed the 18 toughest holes in DE, and Louviers had at least 4 of them (probably amongst 4,5,8,9,10, and 14).
I've heard the term "sporty" used for Deerfield.
Mike Cirba listed the ultra-affordable pair of Soaring Eagles and Ross' Mark Twain near Elmira, NY as hidden gems that I concurred with as I grew up in that area. A note about Mark Twain that even Doak didn't mention in TCG is that all 4 par 3's are uphill.