Oh, as to the amp sections of avrs being generally around 100wpc, that's fairly typical, and suited for typical needs. If you really need significant amplifiers, then better just to get one with pre-outs (or get a pre-pro) and use such, even flagship avr amp sections are only a bit more powerful (generally 150wpc is about where the flagship avr ratings will be, which is less than a 2dB advantage in spl, which isn't much. External amps may have better low impedance capabilities, too.