that being said, not all the companies use the same internals, so some amps are superior to others. Some of the well respected, yet budget friendly favorites around this forum are CDT, AudioQue, and Sundown. High dollar stuff will also be very good, but it's also expensive: JL (their higher-end products anyways), Focal (same as JL), and McIntosh. And then there are the big brand names like Polk and Alpine who make decent stuff, but you should never pay MSRP for it. You can find some crazy deals on those types of brands though easily. And a couple brands to steer clear of would be the ones like MTX, Pioneer (except they make excellent Head Units), Boss, Cerwin-Vega, Sony Xplod, basically anything you can find at walmart. As long as you do some research and ask questions here, you will never end up with a product that doesn't fit your needs. Good luck!