I think there might be a different use case for me but to compare with your economics - I picked up a base mac studio (m1 max with 32 gb) for about $1370 USD with 8 months warranty remaining. It’s letting me test my daily setup to see if everything can run on Apple silicon yet without intervention.. if not, I’ll be able to get rid of it at little to no loss, and decide if I want to carry that much computing power in a laptop or not, or head on to other options.
My interest currently is computational power, per watt. Not much comes close to Apple Silicon.
The cost of a loaded pc can quickly outstrip other options with electricity costs included so it needs to be useful in any case.
The integrated speed of the Apple silicon, ram, and ssd is a little astonishing. More than I expected to admit. I don’t know if there’s anything like it on PC. If Apple silicon supported eGPUs it would interest me.
Comparable PCs have described are generally power inefficient. Still, the system you’re laying out is interesting, especially the ram, mind sharing a bill of materials?