Best site to choose the audio amplifier at home? List some good brands for me?

Best website for purchase or research? If purchase, Cruthfield sells a lot of nice amps, but you can also find a good variety from common stores like Circuity City, Best Buy, etc. Brands you’ll want to look at (in the mid-range receiver market): Denon, Onkyo/Integra, Yamaha, and Sony, but there are others that also make fine products at various price points.

To pick out a good one, you’ll want to know what kind of speakers you’re going to hook up. If you need help figuring out what to look for in a receiver, I found this article that is loaded with useful info: http://www.techlore.com/article/10309/Understanding-Amplifier–amp–Receiver-Power-Specifications/