Good thinking! Getting a laptop if you don’t plan moving it around is wasting tons of money. A PC will give you way more bang for the buck, even if you consider you need to add a screen, mouse and keyboard.
Besides including these 3 (in your case unnecessary) gadgets built-in, laptops simply have to do so many compromises to fit all that stuff into the tiny space - not fun.
TLDR; Don’t build, buy pre-made, but only good ones. @olm has his very specific and undoubtedly unpopular (but science-based) recommendation of using only commercial/professional office PCs, even for gaming. I’d be happy to help find a fitting one.
The “building” (putting together) part is super easy, only need to be super careful when putting the CPU into the mainboard. See for example here.
What’s extremely hard is to choose good components. It’s so hard that companies whose business model it is to sell computers to demanding customers (like my employer) spend shitloads of money to make sure everything works well together, is stable, functional, performant and not too loud. In fact, reputable companies would not ever touch any of the mainboards from Guanghua market with a 3 公尺 pole.
Based on my work (and gaming) experience the last around 20 years, I highly recommend only getting business / commercial office Computers, not consumer ones. In case you don’t do hardcore gaming (which would require going for workstations due to power supplies in office PCs missing necessary connections for high-end graphics cards), these can be had at reasonable prices. The much higher amount of thought and engineering put into these gives you a vastly increased chance of avoiding many of those random issues that plague the incredibly complex modern computers. Of course you are still at the mercy of shitty software, but at least the foundation is stable.
So, who makes “real” professional PCs and where to buy them in Taiwan?
I would go for the commercial lines of the big professional brands, and simply add a graphics card (and maybe sound card if you want to do more demanding/competitive gaming). Those can be had mainly from HP (ProDesk/EliteDesk), Dell (OptiPlex, Lenovo (ThinkCentre), Fujitsu (Esprimo), and more locally maybe Acer (Veriton).
ASUS… Probably as well, see below.
So, where and what to buy in Taiwan? First let’s get an idea about prices online. Yes I’m aware of “no credit card”, but that’s the easiest way to get an overview I guess…
HP has tons on PChome
Dell has only some workstations on PChome, and their Taiwan shop somehow doesn’t work for me right now
Lenovo on PChome
Acer on PChome
Fujitsu (until now even made in Germany. Yup really, including mainboard) is a bit harder to find in Taiwan, on PChome only one high-end model but seems like some companies sell them here.
PChome also offer ASUS, but I have no idea how good their business PCs are.
So, if such PCs are an option I’ll look deeper into it.