Reddit mentions of MyDigitalSSD BPX Pro 80mm (2280-S3-M) M.2 PCI Express 3.1 x4 (PCIe Gen3 x4) NVMe SSD (512GB (480GB))

Yeah, they speak standard SATA/AHCI/NVMe but they use a custom connector type. It's how they lock you into using Apple storage only (thanks Apple!)

Edit: If anyone reading is interested in upgrading their MacBook with a larger non-Apple SSD I've had really good success with these adapters and a variety of NVMe drives. Basically everything you need is in this thread, there are some caveats w.r.t. system firmware updates with a non-Apple drive so read carefully. A quick shout out to the best low cost NVMe drive I've used too. Total cost to upgrade from a 120GB Apple SATA SSD in my SO's 2015 MBP to a 480GB NVMe drive was like $115 and the drive is something absurd like 8x faster.

OK here's my current status. Thanks very much to everyone that is helping me with this :) Currently the whole thing is from Amazon and is sitting at $1,142.57 before shipping.

• GIGABYTE B450 I AORUS PRO WiFi Our starting point. Purely because Tom's liked it.
  
• AMD Ryzen 7 2700 Same.
  
• Gigabyte GeForce RTX 2070 Windforce 8G Graphics Card Because the 2080 from Toms seems overpowered for what I want/need. As u/Overload_inc suggested it might be worth me stepping down to the 2060 and using the extra cash to buy a correctly matched monitor? My current one is 10 years old and I'm guessing therefore not cool.
  
• MyDigitalSSD BPX Pro 512gig SSD The price difference makes it seem like a no brainer to go M.2 on the SSD. Could be convinced to go 1TB though this model got on Tom's best list for good longevity.
  
• Patriot Viper 4 Series Extreme Performance DDR4 16GB (2 X 8GB) 3200MHz Kit Purely because it has no lights on it. I did not dive into caring about timing stats or anything like that. Would be happy to fiddle with this more.
  
• Seasonic FOCUS Plus 650 Gold SSR-650FX 650W Didn't google. Straight from Toms. Given that I downgraded the video card it may be that 650 is too much?
  
• NZXT H500 – Compact ATX Mid-Tower Case because it looks fine and can get it prime from amazon.