Well, I'm not really the person to ask for this as I have not been to all that many shops. However, by far the best room I've ever listened in was at a shop in Boise called The Stereo Shoppe. They have a listening room that was built to the nines. It had non-parallel walls and the whole lot. Even the smallest speakers sounded absolutely huge in that room. There wasn't a speaker I listened to that the room didn't make sound quite good. They all had soundstages that extended well beyond the walls, and the midbass punch from even small bookshelves was outstanding. They also had other rooms with B&W 802D and some Wilson speakers, though I didn't get a chance to listen to them. The staff was also top rate.