You may find this interesting.

http://www.homecinemachoice.com/reviews/hccreviews/Amplifiers/Onkyo/OnkyoTX-DS787.php

I wouldn't get too worried though because, like Sean said, it does depend on how loud you like to listen. If you plan on sitting 8 to 10 feet away from the 80s, you won't need more than 1 Watt nominal. For the majority of material, this receiver will serve you just fine. Just make sure you ventilate it well.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated