I have almost the same room with Maggie 3.6R's and they sound great. Awesome in a big space. In your price range I would try the 3.6r's with a Marchand 3 way X-over to a nice 150+ watt tube amp for the highs (VTL, Rogue, ARC, McIntosh), a Sanders Sound Magnetech amp on the bottom, with the subs wired in as well.
Man, that would be stellar.
Man, that would be stellar.