Get a Lambda Acoustics PB series subwoofer. Probably the best SQ subwoofer you can buy and with more than enough in the SPL area.
I have a PB15 myself, and it as the best sub I've ever heard. It does however require a 3 cubic foot box, but the PB12 can do with a smaller box. They are far superior to the W3. The total cost for me in CDN after shipping and everything was $378 which is pretty cheap considering the level of the equipment
You can get them online from
www.stryke.com www.stryke.com/SALser.html If you find what I said hard to believe, wait and more people will come on and tell you the same
