Maybe I'm missing something here, but to me it would seem the obvious choice for your party/"wild dancing" needs, i.e., "...speakers that will really fill this room with booty moving magic," would be to petition the audiophile gods for clemency and then either buy (used) or rent (from a local party center, DJ, DJ company, etc.) a pair of professional DJ monitors. Occasionally, you can come upon a good deal at eBay such that you can then turn right around and pump them back out after the party and recoup most, if not all of your investment.
Speakers for the party system
Twice a year, we host a gathering of around 120 friends for several days. Across the years, we have gotten much better at supplying food, beverages, camp sites, showers etc. The issue is music for wild dancing! Until last year, we used the main floor of our house and our reference level sound system. Everyone was very happy but me... I always worried about spills, chills and expensive thrills. Last year, we finished the basement and moved the party downstairs. The room is almost the same size (900 sq ft), but with lower (9 foot) ceilings. I bought a fairly descent system, but the party girls wanted much more punch and thump. Can anyone recommend a reasonably priced speaker that will really fill this room with booty moving magic? I've noticed some good deals on PSB scratch and dent stuff but have never heard these. My main system uses Dunlavy V with Plinius SA-100 monos, so the competition is fierce. Song selection includes everything from Mikey Hart to Mojo Nixon, Parliment to Massive Attack, The Beatles to Lou Reed...