Given the OP was talking about not beign a power user, then I would suggest for internet surfing, the odd you tube and of course, forum contributions are the order of the day. I think he is right not to upgrade his hardware unless itis not working well enough for him these days..
It has to be at least 6 years ago now - possibly 7, I purchased for around £550 a HP something or other - 6GB of RAM and an I7 Quad Core - maybe more. It came with WIndows (8 I think, but can't recall) but I already had a monitor and keyboard/mouse. So let's say, c. £650 all up.. It has never skipped a beat; I have only added a second low-end graphics card for dual monitor (well, it can now do triple).
My son now uses it for his digital media stuff and I use it for my day to say stuff,... And, although it is tardy to start up - and yes - could use an SSD, performs quite well - runs MS FSX (Steam and stand alone) quite well, to boot! I have no plans retiring it yet..
I also have a 12 year old laptop which finally did have to be wiped of Windows and I put Linux (Ubuntu) on and I have a 5 year old HP i3 laptop I paid something like £399 for which struggled with the kids games on it but since reinstalling Win10 and keeping it to my stuff, does nicely.. It has 4GB of memory.
There is in intesting video here I found that talks to the superior build quality of the macbooks v the cheapies.. but I don't recall leaning on my laptops the way he demonstrates.. so for the price, I am always going to stick with wintel - as with the plethora of free and open source software these days and the little difference in processing and graphics power, which Apple did have, means I'll keep my money for flying... one day (Iceman will get that last bit)