I still don't understand the objection to a quality receiver. It's not a power thing. I seriously doubt that the integrated amp is going to have better sound quality than a good 5.1, 6.1, or 7.1 receceiver.

The NAD is 2 channel exclusiveliy, so you'd need 3 more amplifier channels and preamp channels. And you'd have a hell of a time balancing the channels and the sub. And boy, is it going to cost you.

A regular amp does not have a preamplifier component, so there is limited control over volume, no component switching, etc.

I am the Doctor, and THIS... is my SPOON!