For a room that size, I'm voting for two 500's. Then get an 800 down the road if you feel you are missing something. I suspect you will not though.... I love my two 500's. I prefer them to the single 600 I had in my HT, and I can't even place them where they should be placed due to furniture placement conflicts. I have them both firing into the room from the front wall, under my screen, whereas they should be on opposing walls like John mentioned.