Todd, an INTEGRATED amp is a preamplifier (the component that does the signal processing) and an amplifier (the component that only makes the signal louder) in one box. An AMPLIFIER does not have a preamplifier section. A receiver has a preamplifier, amplifier, AND a tuner (radio).
So basically the only difference between a receiver, and an INTEGRATED amplifier is that a receiver can pick up radio stations. So, you can use a DVD by itself with either a receiver or an INTEGRATED amplifier, but NOT just an amplifier.
Ken is right. The NAD you mentioned is only two channel. You need to look for a 5.1 channel or 7.1 channel INTEGRATED amp if you want those configurations. But, as Ken said, a receiver will do pretty much the same thing.
