I did a lot of research on amplifiers myself when considering what to put into my Civic. Did a little research on the car, too. Most amps are rated at 14.4 volts, which is something the electrical system in a Civic just can't deliver. So any manufacturer's claims about an amp's power output won't be true when it's in your car. If you meter it with the car at idle and nothing on, you'll probably see about 13.5 volts, if nothing's wrong. Or at least that's what the car guys showed me with mine.

Because of this, my recommendation is US Acoustics. I still haven't ditched my Kenwood CD/MP3 player for an amp yet. But when I do, it'll probably be this amp. And that's the best price I could find on it, too.