For a little different type of panel, try out these guys. Their product is meant more for the pro audio market but it's definitely the same idea.

www.realtraps.com

The other thought is to check out this website:

www.revolutionhometheater.com

They've recently posted some articles by Bob Hodas who designs listening rooms for people. I think there are also links from there to websites of other companies that design home theater rooms. Since it sounds like you can start from basically the ground up, the design route may be the better approach. The panels will definitely help but they're more of a fix than a total solution.

Hope this helps...