It'd be helpful to also know if you will spend time watching movies, TV (esp sports), games, etc. Some of these things have a pretty big impact on what you might get.
Oh, and how much flexibility you have in arranging the room. For example, I'm in a dedicated room - I can put the speakers anywhere I care to, because the wife has her own room for "stuff." Before I had to consult on every movement of anything, because it was all in the living room that was shared function with the rest of the family.
