Ryzen 5950x or Intel 12900k.
The intel is a bit more power hungry and warmer under full loads. The Ryzen is a bit more picky about memory.
Many options on Mobos but Asus or Gigabyte and avoid the cheapest models and you ought to be fine....There is a huge thread on Gearspace full of recommendations for entire builds that is well worth checking out (start at the end!)...getting the other components incorrect (cooling, power, memory, even case) can limit how well your cpu can perform.
https://gearspace.com/board/music-co...ot-thread.html
For a slightly more budget build and I think what I will be putting together in a few months look at the i5 12600k.
Another tip for speccing a machine....check a pro DAW builder site like Scan 3xs where it lets you configure your own machine and you can see which components are chosen as their defaults for different levels of build.