Hey Chino, I'm going through the same process for the 3rd time
. First off, what are your Speakers? Contact your speaker designer or manufacturer. They will be able to tell you how the speakers should be positioned. That will determine which wall to place them. Also, I'm using a company called
http://www.auralex.com/ Ask for Gavin. I sent them a diagram of my room. They will design to your budget. All I can say is do your research. Your room is ONE if not the MOST important part of your system. Listen to the people here on Audio Circle. They all have great ideas.
Good Luck,
Darth