I've long ago given up on speakers, because sooner or later someone will come around and ask you to lower the volume. Unless you totally own your gaming space, I would suggest getting a good pair of earphones instead.
Ive got the old gigaworks 750 7.1 speaker system for movies, I game with headphones though, proper full over ear headphones, FAR better for giving a game "atmosphere". I find being sealed in to game sound only FAR more immersive than any socially acceptable volume level from a big speaker setup. Not sure I would use them for movies though, I dont get "into" movies in the same way.