you could buy a new mac book mini for 39,900
I was debating the same as part of the specs of the desktop that I wanted to get built offered me some choices (like an H75 motherboard against a Z75 motherboard) which I was trying to decide depending on the possibility of upgrading and using longterm.
However, just my personal experience, and style of existence which is also very evident in my audio life, I just upgrade and move to the latest components and technology every two or max three years.
Although I have an eight-year-old laptop just on the other side of the room, I would always advise a desktop/tower machine for longevity and ease of repair/upgrade. My message on laptops is to
only buy them where portability is
required, or where they are a lifestyle decision to match the furniture, which is a different kind of economics altogether.
I built my current computer end-2010. I spent far more than was necessary on the case and the power supply. The case will last as long as the technology continues to have the same basic shapes and sizes. Effectively, I can forget about replacing it unless I really, really, really want to (Highly unlikely, unless I get rich and go for some expensive passive-cooling thing. I'm unlikely to get rich

). Effectively, the same can be said for the power supply, which is
way over-specified, although they do loose efficiency with age, and electrical failures (unlike the case) are possible.
A good case and a good power supply are good investments. I don't
intend to upgrade my mobo/cpu (it is already OTT for mostly browsing and playing music) but, even if I did want to keep up to date, the case/psu would be good for several generations of innards.
Even if I did not use my PC for music listening, I would want it to be quiet, and I did go through several iterations of cooling (at one point a fellow forumite enquired as to if I was
obsessed with buying fans! :lol: ). Again, that is investment which would work with future generations of mobo/cpu. Hopefully, the cpu cooler would fit already, but even if not, I have hopes that a company like Noctua would make the brackets available for its premium products.
The monitor... Again, a lasting investment, and Staxxx has already made that one, which is where the conversation started.
This has been my PC buying/building methodology and, as I have zero interest in upgrading hardware for the sake of it, I hope I am set up for
at least five years with nothing more than breakdown replacements.