To pricey

I own the 804 D4 and power them with a Gryphon Diablo 300 using Transparent cabling, my source is a Lumin P1 and sometimes I go USB out via a Lampizator Baltic 3 DAC. I bought the speakers/amp/source and cabling from the same dealer where I auditioned multiple system combinations from the likes of McIntosh Classe Sonus Faber Totem Aurender etc. I agree with those above who said your amp won’t produce the sonic goods with ANY of the 800 D4 series speakers. I would stick with your Nautilus speakers and upgrade your amp OR if you really have specifically speaker upgraditis you might want to try the Spendor D series for a more neutral/warmer sonic character or stick with a more high resolution brand like Focal Kanta series that are easier to drive than B&W.

I heard the B&W speakers with McIntosh amps at Axpona and they sounded excellent. But if you are considering another brand listen to some Rockport speakers. Superb in every way. Good luck!

Ron 

Listen to a pair of Focal Kanta 3s if you can…warmer balance, plenty of slam, and less $$$.

and here I thought the OP was proposing a toast to his old friend Pricey!

NO! The build/design and parts quality are superior to many British made hi-end speakers. Since B&W is such an aspirational brand they are often driven by subpar electronics with mediocre results.