I was going to say the MSI Tomahawk seems to get rated highly, but I'm not sure if it supports ECC RAM. And I'm not sure if you want to use ECC RAM (i.e. if you're doing processing on the workstation).
Have also seen good reviews of the GIGABYTE X570 AORUS Master for higher end stuff.
EDIT: But as it says in the video the best power delivery is probably what I'd look for in a motherboard for work.
Are you gaming or doing work that leverages the GPU? If not I'd maybe downgrade to a 5500 XT or an RX 580, though I guess that doesn't save enough to go to Threadripper

EDIT2: I should read the OP lol, yes to the gaming, ignore this then.
Kinda related Linus builds Linus Torvald's workstation: