How do I power my 800D(3)s

As others have noted the dealer you purchase the 800s from should help you find the appropriate amplification for the speakers and your room and offer in-home demos. I wouldn't buy a speaker in that class from a dealer that wouldn't accommodate you in every reasonable way.

Personally, I would go with a pre/amp combination with at least 200 watts for the 800s. I love power and I have never heard a speaker that didn't sound better the more high quality watts that were sent to them.

You will enjoy the buying experience and the speakers more when you deal with a good dealer. Good luck and have fun. You are getting an outstanding speaker.

Cheers,

Scott

B&W and Classe have a corporate connection of some sort, which is why they are so often shown together.  Classe is good, but there may be better options.

I would look at Bryston, 20 year warranty on amps and preamps. 

What a great position to be in, the new B&W are a formidable speaker.

The real question is why are you posting this question? Didn't the speakers come from a dealer? Are you seeking advice because you are not sure which brand or combination of components? Or are you seeking different choices from what the dealer was recommending.

It comes down to taste, and price. There are many good combinations which will work well, a famous pairing is the Electrocompaniet Nemo amplifiers or the smaller AW 400 which are very musical and were voiced with the 800's.

The issue with the B&W is the Diamond tweeter is very ruthless at revealing flaws, you are best with a slightly warmer amplifier, choice of dac and cables is also crucial.

I work part time for Audio Doctor in NJ, the owner Dave has 27 years experience in system matching, give him a call 877 428 2873

Congrats.  First, invest in room acoustics. GIK Acoustics has great advice and products.

Next, tubes man. These are definitely speakers I'd pair with Tubes a-la AR, CJ or if SS, Ayre.