I have looked and listened to many sub-woofers and am at a loss.

Does anyone have a recommendation for a reasonably priced ?(~$300)
sub-woofer?

I am considering the JBL Northridge Series E250P, the Yamaha YST-SW315, the
Paradigm line, as well as several of the Velodynes.

Any help would be appreciated.

Thanks,

- Russ