You may be answering the siren call to assemble a separates system for audio or home theater
You may be contemplating an awesome home computer audio section
You may require power for the extra two channels in a 7.1 surround receiver or processor
Whatever the case, the obvious choice is the Onkyo M-282 Power Amplifier
100 watts x 2 channels of 10Hz>100kHz full-bandwidth power will be more than up to the stiffest audio challenge