I am looking to pick up a sub for my computer. Currently I have HTD lvl2 book shelves run by a pioneer vsx-823-K. These are the two subs I am considering at this time. Polk Amazon.com: Polk Audio PSW10 10-Inch Monitor Series Powered Subwoofer (Single, Black): Electronics Martin Logan Amazon.com: MartinLogan Dynamo 300 Home Theater and Stereo Subwoofer: Electronics I am leaning towards the polk as the price is right but really enjoy the dynamo500 down stairs. Any advice or comments would be appreciated.