I am currently in the process of building a new house. I want to add a new HT in my main family room 17'X 16' (hardwood floors, and 11' ceiling). I will be replacing all the speakers and the receiver as well (I'm keeping my new Velodyne SPL 1000). I plan on using the system for 80% Movies, 20% music. My question is whether or not to build a 6.1 or 7.1 system. I have been eyeing the H/K 525 which I believe is a 7.1 receiver. However, I met with a "Custom Home Theater" company last night and the "rep" recommended going with a 6.1 system. He said that a 7.1 system would sound too muddy in the room that I have. He recommened using in-wall B&W 5 1/4" all the way around (fronts and rears) and a B&W center powered by a Yamaha reciever (not sure what model, but it costs around $1000). I realize that the "Home Theater" guy is an authorized dealer of Yamaha and B&W, so I take his advice with a grain of salt. My questions to you experts are: -7.1 or 6.1? -Yamaha or H/K? -Should I use the same speaker throughout the entire system or have larger set for Front Left and Front Right? Thanks for the help!