If you want to go heavy with the server I'd say Ryzen 9 5950X.

Mid range I'd say AMD Ryzen 7 5800X

Entry level I'd say AMD Ryzen 5 5500

For server roles that demand lots of simultaneous threads (virtual machines, heavy I/O, parallel jobs), more cores/threads are worth it. The Ryzen 9 5950X. If you won’t need peak multi-threading, a Ryzen 7 or Ryzen 5 CPU still gives very good performance for web, file, caching, or small container servers.