Keep the NAD. Dump the friend. Or at least, take anything he tells you about audio with a huge grain of salt. Speakers don't "work hard." They take what power you send them, and they do the work. If you're trying to fill a cavern with ear-splitting sound, the NAD isn't powerful enough. But if that's the case, you'll know it. (As in, you'll hear it.) If it sounds ok to you, then the NAD is plenty powerful enough for your system.
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