ok I'm ready to get a new sub. I've been using the tannoy mentioned above but I need something for myself this xmas.

so, what should I get under $500 or so?

I was looking at HSU and SVS which are around $500 but also people see to like BIC subs like the one below which as cheap as it is seems to have better specs than I have now?

so, should I spend $500+ or save some money and get the BIC F12?

* Design: Front-firing 12-inch, 475-watt peak powered subwoofer
* Frequency Response: 25Hz - 200Hz
* Sensitivity: 90dB
* Drivers: 12-inch injection molded woofer with heavy duty surround
* Magnetic Shielding: Yes
* Gold-Plated Terminals:Yes
* Recommended Power: Built-in Amplifier Power: 475 watts Dynamic Peak, 150 watts RMS continuous
* Impedance: 8 ohms
* Dimensions: 17 x 14-3/4 x 17-1/4 inches (HxWxD)
* Weight: 42 pounds each
* Warranty: 5 years parts and labor