Hey Chess:
Having never been through the process, I don't have any substantial recommendations.

But... I will say that with all the bad acoustic issues I've had in my room, I know that if I were building a room from scratch I would definitely be putting absorbant and diffusing acoustic panels in there from the get-gp... especially at those "reflection points" on the walls and ceiling!

::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::