If you're looking for the best value amp (best performance for the price), I'd suggest looking for a class D 3-ch amp. They generally have high power, very low distortion levels, very clear and accurate sound quality and good dynamics (going from soft to loud quickly and powerfully). They also have the benefits of being smaller, lighter, running cooler and using less electricity than other types of amps.
The best value class D amps I know of are from ClassD Audio in California. Just call the owner, Tom Ross, and tell him exactly what you want (number of channels, wattage of each, etc.) and he'll build it for a very fair price.