If you like throwing money down the drain. Sorry to break it to you, but the dealer will try to sell you whatever he can get away with.
Well, two differant perspectives:
1.) I recently switched out a Mac MC402 that WAS running our 800D's for two 501's because one night when listening to music very
loud (though it didn't seem like it) the owner of my store and I thought we heard a bit of distortion during some passages...not a problem after the switch.
2.) The B&W guys are quite found of running the 800D's off of the new Rotel Class D amps and say that they have more than enought to run them. I listened to the 100 x7 unit run 801D's in Worthing and was quite pleased with the sound, but I didn't have as much time as I would have liked and I didn't run the volume up quite
as high as I would have like to either.