these subs are good enough to bring out the missing bass. talk about low bass...
anyways..they are dual 8ohm, so i would highly recommend getting an amp that is bridgeable to handle 4ohm. i would get this amp:
http://thezeb.com/caraudio/us_acoustics.html
the USX2150. it is rated 150x2 watts RMS, but you can bridge the amp get get 450x1@4ohm. mind you this is rated at 12.9volts so most likely you will be getting little bit more power than that (close to or about 500 watts). price? $164.99 plus $6.95 shipping. not to mention you get 3 years warranty on this amp.