Challenging Speaker Situation

I have a 20' x 20' billiard room. Other than the usual square room concerns, I am looking for the best type of speakers (and their placement) to use when I'm standing and shooting a few racks. I want to get quality sound up at the listening height, but still need the music to fill this relatively large room. I like a well balanced sound quality, and will be listening to mainly jazz and rock. Amplification isn't a concern, as I have a variety from which to choose, one of which would match just about any speaker that I use. Any advice would be appreciated.