@skyscraper
Gifted Listener for Vandersteen, Magnepan, and my favorite there, Vienna Acoustics Liszt.
Evolution Audio for Aerial.
Command Performance for Dynaudio, Focal, Devore.
But you must get yourself to Deja Vu, for Harbeth.
The nearest store to DC with Spendors is in Philadelphia.
Capital AudioFest. Check the list of exhibitors. It may or may not be worth the investment (time and money).