These are great little boxes. Got a few second hand and they are power efficient and quite capable.
I've always wondered what those types of PCs are for, other than enterprise workstations in offices. What do you use your home server for? Serving media?
I have one (i7-6700T, 32GB RAM) that cost me about $250. Runs proxmox. A few VMs for trying new BSD/linux releases, Plan 9, etc. A Windows VM. A minecraft server. A couple dev/test servers. I have another small PC next to it running stuff like Plex and webhosting that I'd like to containerize and move to a VM on proxmox.
Right now my homelab hosts a MediaWiki instance for personal writing, a couple of instances of Foundry Virtual Tabletop for playing D&D over the internet, and a handful of video game dedicated servers. Most importantly though it's a practice environment for genetal systems administration
General "thing" to ssh into.
Dev box for local development.
File serving.
Home Assistant server.
Testing Container stuff.
I've got one in use (it was my father-in-law's desktop PC when he was still alive) as a node in my k8s cluster. It's currently got a couple of Gitlab's microservices, one of Harbor's microservices, ntfy, Nextcloud, coredns, and a couple ephemeral MySQL backup processes running.
But what are those for? Like what applications do you run with then and what are you using them for?
The Gitlab microservices run Gitlab; the Harbor microservice runs Harbor. ntfy and Nextcloud are their own services, and coredns serves DNS to the network. The MySQL backup processes are for small apps I host for myself and for a friend's bar.