You can't have too much amplification or sound decoders... this is what I've learned so far. The wide array of formats really requires a receiver that can decode just about anything if you want to play back the movie the way it was originally setup. This is why I went with the Pionner Elite 94TXH.
Your room is huge, you better get 2 EP500's if you want to blow the doors off... and save up for 7, 1000watt amps. And no I'm not kidding. Including the attached bar area, my room is about 6,000 cu ft. and its loud... but it could be better.
Here is an interesting aside. If your HT is in the basement, don't expect the floors to shake unless you've installed a subfloor. They are, after all, 6" thick concrete. I had my system cranked up and was impressed...then I went upstairs and was blown away by how much the house was rockin'
