zack, I have the HK630 and the Epic 80. The HK630 has a lot of power and will definitely play the M80's louder than I think you'll care to hear them. I don't know, maybe you really want to go deaf. Mine plays very loud and sounds great.
I'm not denying the fact that the HK7300 does have more power and it is the top of the HK line, but wait until you hear the HK635 before you make any decision on the HK7300. I think you'll be be plenty pleased with your current purchase.
As far as anything else is concerned, you can use seperate amps for just the fronts if you really want more power to the M80's and leave the rest of the speakers for the HK635 to power and you will be fine.
The HK635 is an excellent receiver.
