If it were me I would spend a little more money on a nice or really nice set of bookshelf/monitors instead of some cheap towers. In a 12x15 room you don't need a ton of volume just for the sake of volume (Polk monitors, Klipsch reference). Get something with a great overall sound.
Not knowing your preferences toward sound or budget the forum members can only recommend what they/we prefer to our ears. You may need to go out and demo as much as possible to take advantage of many of the 30 day in home trials or 60 days with Crutchfield.
I would look toward something like the NHT Classic 3 or Swan D1.1SE or 2.1SE or Ascend Acoustic Sierras. There are of course many choices in and around this price point that are probable equally as good.
Klipsch RF-62II, RC-500, RS-400, SVS PC12+,
Def Tech SC8000
Harman Kardon AVR 1600
PS3, Apple TV, Sharp 70" Qattron