The store Connnorrr was referring to in Dallas is Audio Concepts. Here's the link to their homepage:
http://www.audioconceptsonline.com/
I use them whenever I start jonesin for another pair of Grados. You won't find variety in regards to brands. What you will find, however, are the full model lineups (almost) of two of the industries long time cornerstones-Grado and Sennheiser. Only two, but the two that embody and have perfected their own unique and unmistakable sound, yet each ones sound a complete departure from the other. Combine the great audio, emanating from your choice of Grado or Sennheiser matched with Grado's RA1 amp and another amp for the people who choose Senns. Kick back in the chair, pop in YOUR music, or theirs, and enter nirvana. They don't hassle, push, or rush you. Once situated they very much respect the process and all that entails.
The one drawback. . . UNLESS DEFECTIVE, ABSOLUTELY NO REFUNDS OR EXCHANGES. But for someone like me who knows that Grados are the sound I seek, combined with detailed and uninterrupted listening sessions-its usually not a problem. However, my next purchase will be something in the RS2is or up, and that's an amount of money I want some added wiggle room with
and luckily Headroom loves their customers just as Audio Concepts does-their just a little more forgiving