Ryzen is the way to go for a workstation build right now, currently waiting on their Zen3/Ryzen 4000/5000 announcement in the next month or two.

Getting a B550 chipset looks like a good way to go, minimal functional difference between it and the nominally more premium X570 chipset, though B550 doesn't need active cooling which is great. https://en.wikipedia.org/wiki/List_of_AMD_chipsets#AM4_chipsets

I was tempted by the NZXT H1 option, but the damn thing is sold out all the time, and frikken expensive at $630.

Cooler Master NR200 case sounds fantastic.

= Premium newest parts =

|| CPU    || Ryzen 9 3900X || 780 || - ||
|| Cooler || Included Wraith Prism || 0 || - ||
|| Mobo   || ASUS ROG STRIX B550-I GAMING || 359 || Has Intel 2.5G LAN ||
|| RAM    || G.Skill Trident Z Neo 32 GB (2x16GB) DDR4-3600 CL16 || 120 || Already own this, actually like $265, but this price is to replace the RAM in suomi ||
|| GPU    || GeForce RTX 2060 SUPER 6gb || 650 || - ||
|| SSD    || 1TB NVMe M.2 || 280 || Samsung Evo Plus or WD Black or something, won't be PCIe 4.0 ||
|| PSU    || Corsair SFX 600W Platinum || 240 || - ||
|| Case   || Cooler Master NR200 || 160 || - ||

About $2500 all up.

= Motherboards to consider =

 * $340 https://www.mwave.com.au/product/asrock-b550-phantom-gamingitxax-am4-miniitx-motherboard-ac35452
 * $360 https://www.mwave.com.au/product/asus-rog-strix-b550i-gaming-am4-miniitx-motherboard-ac35546
 * $330 https://www.mwave.com.au/product/gigabyte-b550i-aorus-pro-ax-am4-miniitx-motherboard-ac35557
  * Realtek 2.5G LAN

= What I ended up building =

The new Ryzen 5000-series stuff, plus RTX 30-series GPU: https://au.pcpartpicker.com/user/furinkan/saved/#view=62DfvK

Then the cooling plan went out the window and I made a soft-tubing custom watercooling loop: https://blog.meidokon.net/2022/06/15/watercooling-performance-notes/

It runs real quiet now. Total price is... kinda unknown, but the PC Parts Picker list is the starting point.