That's a pretty small budget for a room of that size. You'll want as much output as possible for your money, I would go with the Elemental Designs A2-300 or A3-250. Neither will be enough to pressurize that room but you may still get some bass if you experiment with placement. Honestly I would double your budget and look at the Hsu VTF-15H, or Elemental Designs A7s-450, or Epik Empire, or CHT 18.1.