What are the best amps for B&W N802's?

There are good choices, depending on your budget. Classe CA-M400 or Bryston.

There is no definitive "best" of anything. There are way too many variables involved. The "best" you can hope for is to find something that works well in your system. You can then say it's the "best" for you until you find something you think is better !!!!

McCormack DNA-750s, 650-Watt monoamps. The best I've ever heard, and I too didn't think I needed that much power.
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There is a definitive answer. The best amplifier for the B&W N802 speakers is the.................wait for it...................wait for it...............the deHavilland 50A's, first made by Fischer in the 1950's and reissued by deHavilland Electric Amplifier Company.

Any questions?

Any Krell FPB amps would do wonder to those N802