Now since you refuse to join the dark side, have you looked into Hackintosh ? That would be best of both worlds probably. or if you like the general Linux feeling, there are plenty out there, that wont be that much different than MacOS. Both are derived from Unix, just MacOS is completely closed source and a locked platform (since that is Apple business model).
I mean i get it, Mac is nice and so on, but LR + PS is hardly Mac specific workflow and Mac prices are frankly outrageous....mac Studio in DE starts at 2.2k and goes up to 7k+...and that is just the unit alone, no monitor included...i can spec 3-4 dark sides, with 2-3x the power, for that price (and that is with a very decent GPU, If just doing photos, GPU acceleration is less important, one could go lower model). And best is, one can just upgrade a PC as you please, meaning any future cost will be way lower. Meanwhile with Mac you can more or less throw it in the bin, and even if upgrades like RAM are allowed, they cost an arm and a leg.
Less money spent on a computer means more money to be spent underwater 
M1 is an interesting chip but vs current AMD offerings, and upcoming Zen 4, it might not fare off that well, especially given the prices. Currently it it very slightly better in single threaded workflows (vs existing Zen 3 lineup, once Zen3D and Zen 4 get released that won't be the case most likely), but once considering multi threaded workflows, it gets is ass whooped by AMD significantly.
As for monitors, have a look at sites like:
https://tftcentral.co.uk/
https://www.prad.de/
https://pcmonitors.info
https://www.displayspecifications.com
There is RTrings too, but they seem to force registrations now and slowly moving to paid model.
Monitor industry however is nothing but a cartel - due to the way lower volume and competition vs TVs, there was very little innovation, and basically "manufacturers" (i.e mostly re-rebranders) just keep peddling the same 8bit+FRC, 350cd/m2 panels (mostly made by one company, AU Optronics) for a decade plus. The only thing that has finally moved forward is color spectrum, with a lot, even lower end monitors now covering 95%+ DCI-P3 and Adobe RGB. However prices remain rather crazy, with anything better, especially with better HDR implementation like FALD, costing thousands. Meanwhile TV business is steaming ahead, with perhaps LG being recently the best example - absolutely amazing OLED panels, 10 bit native (12 bit color processing) and prices as low as 1k. These actually been a huge hit amongst console folks, to the degree that they will even release 42" version this year, that might be finally small enough to be used with a PC (there, forbidden word).
And what monitor "manufacturers" are doing? Literally buying the same OLED panel from LG, rebranding it as a monitor (and adding Display Port) and selling for 1.5-2x price.
Now yes, there are higher end folks, eg. Eizo, Dell etc that cater specifically to the photo/video folks. These indeed are higher quality, where you pay not only for color spectrum, but mainly panel uniformity (i.e. you pay for the highest "bin" in a given batch of panels), longer warranty or things like being made in Japan, and not China. So price is high, but if in the workflow every pixel matters, guess justified to a degree.
Personally I would look for two choices - LG has already released a 32" OLED monitor, and boy it beats anything out there. Was about 3k, prices came down to 2k now. 99% of both DCI-P3 and Adobe RGB, Display HDR 400 Tru Black.
Alternatively wait, Samsung is about to release QN-OLED this year (albeit first as a 34" curved panel), but more and more actual TV manufactures are seeing the market with smaller panels, as such it seem that we might finally have some kinda revolution in the monitor market.
Anyways, i will now stop boring everybody. If you need any help, just ask. While i might stink at photography, i do know a thing or two about computers.
Also...
