The site that you've linked blocked me for some reason, and cost/benefit in Malta is bound to be different from the one here in LatAm, but I've recently built a midrange-ish computer, so might as well list what I bought for reference.

• CPU - Ryzen 7 5700X3D. Good cost/benefit ratio, and rather good performance. I had to buy a third party cooler as the CPU doesn't come with one, so keep that in mind. I considered the Ryzen 5 5600 for budget reasons, too; it might be an option if you want to make the build cheaper.
• Mobo - Gigabyte B550M Aorus Elite. If coupled with the above you need to Q-Flash update the BIOS, but that was relatively painless. So far it's working great, can't complain about it.
• RAM - I went for 2*16GB instead, mostly to future-proof my build. The brand is Apacer Nox, I didn't find people complaining about it and it had a reasonable price.
• SSD - Adata 480GB.
• PSU - Gamdias Cyclops M1-750B, 750W. Frankly my method to look for a PSU was to look for 700~800W ones in a local forum, with the word "porcaria" (rubbish, shit) alongside it so I could see complains, then I found people actually praising this one.

If I convert my overall costs from reals to euros it was around €500, but keep in mind that I didn't buy a new HDD or a new GPU. GPUs in special are relatively expensive here, I'm hoping that the prices go down next year.