the yamaha yst sw315's are servo controlled, and they have a switch for movies and music. while it won't plumb the depths like massive mondo expensive subs, it is neither massive mondo or expensive, either!

for me, this is about the only thing in your price range i would be looking at... when i had to put my vmps' into storage for a couple years, due to my living situation, i used my yst sw305's in a room ~16x24, crossed over to a pair of coincident victory's, and it was a worthwhile improvement. definitely musical, and w/no muddy "boom"...
doug s.