Great news! I started my selfhost journey over a year ago, and I'm finding myself needing better hardware. There's so many services I want that my NAS can't handle. And I unfortunately need to add GPU transcoding to my Jellyfin setup.

What's the best OS for a machine focused on containers and (getting started with) VMs? I've heard Proxmox

What CPU specs should I be concerned about?

I'm willing to buy a pre-built as long as its hardware has sufficient longevity.