Building new house need advice on a dedicated room

What's your budget. If you want the best, go with Riva. Don't ever use an installer or a regular contractor. Check out local brick and mortar audio stores for a referral, and do not make the mistake of using the store itself. Also, revise your forum query to include your zip code.

Be sure to place the entire foundation on seismic isolators prior to constructing the house. They will be very difficult to retrofit once the house is built.

How many times can the same question be asked?

In any case, Auralex.com has a whole section on it.