I found this one almost by accident: the Audio by di Tomasso room was two doors down from the Saturn room, and I read in the show program that the di Tomasso room had PMC speakers, which had impressed me in the Saturn room. And the Audio by di Tomasso room turned out to be something of a find. The speakers were indeed PMCs, but stand-mounted 25/22s ($5200/pair) rather than the floorstanders in the Saturn room.
I don't know whether it was the speakers, electronics (Lumin V1 mini digital transport/streamer, $3000; SPL Director Pre/DAC, $4200, SPL Performer S800 amp, $4300) or some fortuitous combination of equipment and room acoustics, but the result was a kind of magic: music presented with natural sweetness and a minimum of artifacts, lacking only, as the speakers' size would dictate, low bass. This was one of my favorite rooms at the show, regardless of price (the total here being $17,500.)