jeffreyw
All the above recommendations will sound fine, but you bought the B&W 800 because they are B&W’s flagship speaker, why settle for an amp that is "fine" with them.
The Pass won’t have amperage ability of the Gryphon, and many say have the "Mosfet haze" to their sound, and the "transformer coupled" SS Mac’s, will have even less control. But they both will sound "fine".
Get the Gryphon Diablo 300 which will control them far better than any other mentioned here, and have the magic transparent class-A sound they have also.
Cheers George