I would avoid spending a lot of money on speakers for a small untreated room. The room will affect the sound as much as the speakers. Pumping a lot of bass into the room will result in a lot of modal interference will substantial peaks and troughs in the response.
100% agreed! I have a small Bose 5 (or 50?) in my livingroom. I use these for anything and they do the job very well and have a great "tone spreading" (almost surround like). On them, I listen to music, play PC games, play Keyboards, do some Music editing (not actually mixing) and - of course - play my guitars. If I need to tweak or edit anything critical, I use Headphones.