NAD T 765 upgrade in audio performance (1 Viewer)

[thxbest]

I have a NAD T 765 HD Receiver, the new model from 2013 with HD Audio (VM100/AM100) Modular Design Construction (MDC). I have an offer from my colleague who wants to buy the unit for $770. The reasons I bought the NAD was because I wanted the best audio performance available in an AVR.

So my questions:

1-Is the offer strong enough to let unit go?

2-What unit at a price range of $800 (used one) will outperform the NAD T765 in audiophile sound quality?

Thank you guys for advice.