Hi Dean, thanks for the help, I watch TV Shows, DVDs and Blu Rays mostly, I'd say 35% in 2.0 and the rest in 5.1, 6.1 or 7.1 (Movies from the Satellite, Dvds and BluRays). I'd be using the same M3s for either set-up, my TV is a 52 inch LCD and I'm sitting about 8.5 feet from it, I'd say it's a mid-sized room but I have a lot of couches so they take some space, I made a drawing of my current 7.1 set-up with back surrounds:



The couches are bigger so there isn't so much space between things but it´s generally accurate.
What do you think?; Thanks again for all the help.
Eduardo.