stay away from the cheap stuff, and stick to the name brands mentioned above in other posts. In my own personal opinion, and from experience of using almost all of the name brand subs, I LOVE my Eclipse aluminum cone subs. They are the best subs i have every owned!! HANDS DOWN!! They are pretty expensive, but I will never have to buy another sub again. The cone is aluminum, which disapates heat made by the voice coil very efficiently, and that means you can pound the hell outa em! The sound quality is excellent, and the craftsmanship is outstanding. I have put over 2000 clean, class D mono amp power to this sub, and it keeps poundin! If you have the money, go with the Eclipse line. As for amps, if you want power for your subs, go with a good class D mono amp for the best bang for the buck. Most popular companies make them. I personally don't care for JL audio products, mostly from bad experiences with them. Brittle foam surrounds, and the paper where the mounting holes are, seems to separate over time. I do believe the new subs are better built though...

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
My webpage: http://eclipsed4evr.home.comcast.net
-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)