You have a healthy budget and whatever you end up doing will probably be wonderful, just a few comments here.
First, I don’t think that you require separate systems or speakers, one set for music and one for movies, especially at your budget. If speakers and amplifiers can’t be good for both, don’t bother, imo. (I have a dedicated two channel system-my “high end” system—and 2 HT systems with mid fi equipment. My main priority is listening to Classical Music, and both of my HT systems, while definitely a notch off the two channel, are still satisfying musically, and especially during the pandemic I have been listening to them more to move my rear end into a different room!). If I had two different systems in the same room, I would have bad Audiophilia Nervosa, constantly switching between them (Are these speakers really better for music?, etc). Just settle in with one system and enjoy.
Second, I’m +1 on B&W speakers. They get a bad rap here, mainly because they have some ubiquity, but if you have enough power to drive them, they can really sing.
Third, I would have all Speakers by the same manufacturer, to match timbre. I found myself having to replace a set of in walls when for music they were a bad match with the fronts. You can get good results with mix and match but it is more of a crapshoot. If the speakers don’t mix the discontinuity or mismatch can be obvious, and at your budget, with the increased resolving power of the rest of your system, it may be really obvious.
