I split my time between DC and NYC. My favorites in NYC are Rhapsody Audio and In Living Stereo. My favorite in DC is Deja Vu (actually, in Virginia, but not far from downtown). Among the three, Deja Vu wins hands-down for the equipment (some of it is amazing), friendliness, etc.; they also do a good job repairing equipment that they do not manufacture or sell. My least favorite, as many have indicated, is Sound by Singer. In addition, I sometimes try to visit manufacturers when I travel. Especially when dealing with a small company, it pays to be on friendly terms with someone who designs/makes the equipment.