Building an unBox - Advice on CPU spec

Hey! I've had a play around with UNRAID in the past and now looking into building a production system.

The workload of the server would only file storage (No VMs or docker). It would be hit with file requests from plex, day to day file storage from arround 2 people.

I would assume even a celeron could handle this. I am on a budget of upto £120~ for the CPU