Advice for custom i7-12700 virtualization / plex server build

Technology Hardware
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I currently have a Dell Optiplex 9020 SFF (Intel Core i5-4590 3.3ghz cpu (no gpu/igpu), 32gb ram) running as a Proxmox virtualization server. I also have a Synology RS822+ fileserver that also hosts Plex.

I’m out of resources on the Dell, and I want to take the Plex pressure off my file server. So, I would like to build a new server and combine the virtualization and Plex functions into one server. So I guess Plex would run as a VM in Proxmox.

EDIT:

I changed my plan, went with a modern cpu, a i7-12700. 65w, 12c/20t, quicksync, igpu…

Any recommendations on a motherboard for this cpu?

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Beuller? Beuller?

Any Motherboard Recs?

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Edit: title