I have the RPW-10 and am very pleased with it. It will not shake your house of the foundation (which my wife would not tolerate anyways), but it has a very pleasing, and tight bass, and more than adequate power. I have the volume set at only 1/4 in a bigger room than yours. I used the Radio Shack sound meter to calibrate it to my other speakers. (RB51's, RC52, and RB10's) I would suggest that you demo both subs, and pick the one you like the best. Best Buy carries both of them, and allows you to return them within 30 days, no questions asked.