I am very happy with an inexpensive system in my studio, so I'll share the pieces for the prospective buyers among us. This system is used almost exclusively for music but doesn't hesitate if pressed into home theater use.
PC (itunes) with kx effects (active crossover and correction) - free
80's Yamaha Amp (~40w/ch) - free
Monitor Audio BR2 - $200 used
Velodyne CT100 sub - $75 used
occasional grado sr-80 use