Good HiFi stores in NY, Washington DC area


Hi, I'm looking for recommendations for good HiFi stores in NY, NJ, Philadelphia, Delaware, Maryland and DC metro area. I'm looking to buy good condition pair of used/demo Speakers (for Pass XA 30.5). I've shortlisted wide range of brands (coincident, silverline, Von Schweikert, clearwave, DeVore, Tannoy, Proac) etc. or any other suggestions please... My priority is to listen to...

Coincident (Super Eclipse, Super Victory)
Silverline (LaFolia, Sonata III)
VS (DB 99)
DeVore (9s, O/93)

I can travel out of my way for the above models. I plan to audition and buy speaker during my short USA trip in July 2016. Thanks
kartikeyp
Proac at Deju Vu Audio in McLean with lots of gorgeous boutique low watt tube amps, also in Verona NJ (at least they used to have them) with ARC amplification; Devore and Raidho at Command AV in Falls Church; Vandersteen Maggie's and Linn at Gifted Listener in Centreville VA; tons of expensive Dynaudio and more at JS Audio in Bethesda MD; The Listening Room in Pikesvilke MD (near Baltimore) used to have Von Schweikert and ARC; tons of rooms of gear at David Lewis Audio. Could spend two weeks there alone. 
+2 John @ Audio Connection.  Yes, John still carries Proac.  Soon I'll be switching to Vandersteen.  Regards........