You need larger speakers for that size room. Considering your budget I'd look at the Cambridge Soundworks Model 6 at $149 a pair shipped from Amazon. The model 6's have large drivers and don't require a sub but you can add a bass cube for $100 more. These offer great bang for the buck and were voiced by the late great Henry Kloss.

For Power look at the Maverick Audio Tube Magic A1 amp for $199 and the Tube Magic D1 DAC for $199.


http://mav-audio.com/store/