Ben K.:Living room is 17ft x 14ft. I have a yamaha rxv2065 with a rotel rb1510 power amp powering the front left and right mid/bass and the rear surround of the yamaha powering the treble. For movies a pioneer bdp-320 blu ray, for music marantz cd6003. Current speakers Br2, Brlcr, Brfx and Rsw12.
I'm not familiar with your Yamaha, but both speakers, although very good, will give you something different. The BX6 is a floorstander which means bigger bass extension, and generally, need to be sited a little further from the wall. If your system is firing down the 17' then it won't be problem. On the other hand, RX2, a stand mounted speaker will work better in confined spaces i.e. if they're firing across the 14'. Generally, standmounted are little more agile and are slightly less coloured in their presentation than price equivalent floorstander.
All the above theory gets blown to pieces if you have a forgiving room acoustics. This hobby is more complicated the more you upgrade; the better the equipment, the more demanding it is on room acoustics, size...