I'll agree on the underpowering an amp is not very good for the speaker. A manufacturer would rather you slightly over amp a sub then under amp it. I would recommend, from personal experience, the <a href="http://www.polkaudio.com/caraudio/products/amps/all/c500_1/" target="top">Polk/MOMO C500.1</a>. It's a small amp that puts out lots of power. Even though it is only rated at 500 watts @ 2 ohm, it puts out close to 600, I think mine was bench tested at 560 watts, RMS. I've got it pushing a DVC 12" rated at 400 watts RMS, 800 max. I keep everything tweaked down, the gain, boost (both HU EQ and sub EQ), with the upper roll off set fairly low, around 120 Hz I think. I've got some very clean sound, very loud sound, no hint of any clipping, distortion, excess heat, or anything...no matter how loud I listen to the music, or how heavy the bass. I've had it cranked on compition bass CDs for around 30 mins, and the amp was still cool to the touch.