Mrodz, I sent you an email. Also, be careful of the flooring. You don't want too much reflectivity - porcelin may be really difficult to keep the reflected sounds under control, especially if this is a basement install. Wood is lovely, but it is very difficult to get the sound under control like when in a carpeted environment. You don't realize just how much added reverberation is in the environment until you move to a carpeted room. I used 1/2" carpet pad and a THICK berber carpet. I still put in generous room treatments to keep the sound under control, reducing unwanted reflectivity.
For ultimate sound diminishment to upstairs (in basement install) consider, if you have the height, a double ceiling. Solid ceiling underneath a drop ceiling. Allows for completely solid barrier between HT and rooms above. Also allows cables to be run between them, which means you can later change them easily! Don't forget to put a plywood "projector plate" in the ceiling if you're going to do front projection! You'll need something to mount the projector to. (and about 10 other considerations, just for ceilings...)
If you do sheet rock ceiling be eternally sure of your surround speaker placement! I built 3/8" sheets of plywood 2'x4' into the walls at projected surround locations and ran surround wiring to electrical boxes nearby each so that I could mount any size/weight surround I wanted as well as change them out later. (and about 20 other details to consider in mounting surrounds...)
Like I said in the email, read, read, read, before you do this. If you're not willing to read, then pay someone who specializes in these rooms to plan it. A general contractor may not know nearly enough to do the room right (not ripping on generals; there's just feakin' LOTS of details with these rooms!). If you pay to have it done quick and cheap, you'll likely regret aspects of the room.
It takes TIME to think out all this. Do NOT rush the process or you'll regret it.
