Just to further confuse the issue... I have a similar room (well to be honest the listening area is not very large, but it opens to the kitchen, dining room, family room and two hallways). My budget was about the same but with the recent sales pricing I went with two Ultra12s from Emotiva. Each one may not have the output you'd want optimally... but with two of them they do at least as well as a single 15 (IMO) and don't break a sweat.
