30k not a small amount, but a big amount, you can easily afford asus TUF pro or ROG series. wi-fi costs 1500 extra. Asus tuf x670e pro or rog x670e or tuf x670a pro. MSI, Asrock etc next mouth.I meant cheapest mobo which would support, not just cheapest mobo... For motherboard, I am expecting around 30k to spend. Yes, would need high end 1200W or more psu, water cooling, Liquid cooler for processor and all the stuff... Yes, I am looking at X670 for now, will see which best supports in the cheapest price among them.. There are many variants in X670 too.
Threadripper and A100/A6000 is way too high in price, lol. I am not even thinking about that...
Dual cpu - consider x670e chip set , for nvidia look for nvlink