I would match the sub with a pair of JBL LSR305 (that I just bought, haven't received yet). For music and movies off my computer. Obviously staying within a budget of ~<$150. The monoprice are on sale now for Black Friday so now's the best time to decide.
Monoprice 12" (9723): http://www.monoprice.com/Product?p_id=9723
Polk PSW10: http://www.amazon.com/Polk-Audio-10-Inch-Powered-Subwoofer/dp/B0002KVQBA (the more I look at this the less I like it)
Or a different sub entirely?
Edited by Royal2000H - 11/28/14 at 11:08am