Are you looking more for someone to design you a system or the room? I had spoken to many when I was trying to design my room from the scratch. It was disappointing that when I talked about design, pretty much all of them were thinking of just sticking aftermarket room treatment pieces on the walls.
I told them that I want to either avoid using any of them, or incorporate them as part of the aesthetic design of the room, but I did not want those elements to stick out like a sore thumb. Pretty much all of them gave me a blank stare and didn't know what I was talking about. The only one that even understood what I was talking about was a professional acoustician who designs music halls and recording studios. He was gracious to take time out of his busy schedule to talk to me as a favor for a mutual friend. His fee starts at $50k.....
But if you are looking for someone to "fix" problems in an existing room, and aesthetics is of no concern, most of these guys will do.
There is a difference between a good listening room vs. a good HT room. Most of the guy designing you an HT room will want to absorb excess energy from your speakers/subs. But I think for Audio, you want to keep the room a bit more livelier.
Good luck,
FrankC
