The REL Q series are small amps with enough output for that sized room. I am using the Q108E for music in a room that is 13' x 10' with 17 foot ceilings and it has more than enough output for me. $750 new.
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I'm using Sunfire subs because I was captivated by Bob Carver's innovative technology. They seem to work well with my systems (I have five of them in various rooms.) Another brand that looks a lot like Sunfire and may be comparably acceptable for WAF is Earthquake.
Also, REL has a line of subs dubbed the "Q" range that might be worth checking out. Notably, REL's regular line of "ST" subs has gotten good support from other posters here on Audiogon. (Personally, I replaced an old REL Studio Mark II with a Sunfire True Sub Mark II in one system, and the sound improved noticably.)