Amp/Preamps vs. High end AV Receivers

Thanks for all your responses and let me add more details to get more intelligent inputs.

AV Receiver - Onkyo TX NR809 (Model from 2012) (HDMI, but no 4K)
5.1 Setup
Bowers & Wilkins Speakers and Sub.
Front: B&W CM8
Center: B&W HTM62
Rears: B&W CM5
Sub: ASW610

I watch movies and listen to music + music videos (frequently).

Hope this helps to give more solid inputs. 

Thanks for all your responses and let me add more details to get more intelligent inputs.

AV Receiver - Onkyo TX NR809 (Model from 2012) (HDMI, but no 4K)
5.1 Setup
Bowers & Wilkins Speakers and Sub.
Front: B&W CM8
Center: B&W HTM62
Rears: B&W CM5
Sub: ASW610

I watch movies and listen to music + music videos (frequently).
Looking to upgrade to Dolby Atmos Setup 5.1.2. Have not decided on the speakers for .2. My current receiver does not support it.

Hope this helps to give more solid inputs.

Well, I’m still using my TX-NR809 in my bedroom system. The thing is a 40 pound beast, and I’m not sure you can get much better audio quality with any of these newer AVRs.

And 4K capability is not really required in an AVR if you get a UHD Blu-ray player that has dual HDMI outputs, one for video and one for audio. You connect the audio one to your AVR and the video one to your 4K TV. This is what I’m currently doing with my Denon AVR-X5200 and Oppo UDP-203 in the family room system.

I’m also using a separate power amp for the front L/R channels in both the bedroom and family room systems.

Edit:  I see you added that you want to go to Dolby Atmos.  That WOULD require a new AVR or Pre-pro. 

when I replaced the front channels on my Onkyo AVR with a same power Parasound amp, I was quite surprised at the huge difference in sound quality, both for music and movies...

For your speaker surround system you don't really need AV separates cause they will cost you more. Just get a very good and very competent av receiver.
Get the Rotel RAP-1580 av receiver for your B&W speaker surround system. The Rotel will pair really well with the B&W. The RAP-1580 is Rotel’s only AV receiver model and it currently retails for $3800. It is a great sounding receiver and its stereo performance for music playbacks is pretty good especially coming from an AV receiver.

Or at cheaper price point I highly recommend the Cambridge Audio CRX200 av receiver currently retails for $2k. It’s pretty musical sounding av receiver. It will sound good on your B&W.