Sanity check on new system?

I agree with noromance. These are fairly safe bets all around, but might not have the best synergy. If you want headbanging volume levels, you might be better off with a more powerful amplifier, maybe something with KT120 tubes. On the plus side, all these brands hold their value rather well.

If it really is to be your first system, I think you’ll be blown away by the sound. You could do a lot worse.

Thank you for the feedback. As far as not being state of the art - what would be the best bang for the buck to change? In selecting these components I have gone for for a balance between modern components (805 D3, MP100) with high quality vintage components (VPI Classic3, MC275). Speaker and pre-amp technology seems to be the most rapidly changing/updating so I chose recently released components whereas amp and turntable technology seems more stable/slower moving so I'm planning on going with some "classics" there.

That is a big first system step. I am a big proponent of buy right or buy twice, that said, what is your goal of this setup? What size room? What style music? What do you enjoy most about listening to music?

How do you control the volume?

I haven't heard the 803s, but from everything I've read, it seems they perform best with high power. My KT88 Cayin amp was modeled after the MC275 and has similar power. I don't think I'd want to pair it with B&W 803s, but if you already own the 275, won't hurt to try it. 

It's best if you can manage to audition gear somewhere, especially speakers, as they will have the greatest influence on your system's performance. You might discover you don't like B&W.