I personally have the RM6750's and I love them for my room 13.75' x 14.5'
I have tested them against the Klipsch HD300 & HD500, Boston Acoustics MCS100, Polk RM705.
Out of the ones I sound tested the Polks sounded the best. I went with RM6750's because they sounded the same as the RM705's and were have the price.
Energy Takes 5.0 are $230 and then you need to buy a subwoofer for around $125
The RM6750 5.1 set is the best value sounding system