Been a while since I built a machine, but it's still something I like to do once in a while. Going to keep my stuff going for longer at this point though. Also prebuilt business class desktops are a good bang for the buck on Ebay and since they are small they don't cost that much to ship compared to servers or full size towers. My latest server upgrade was actually adding 2 Proxmox nodes which are HP Prodesks and I just maxed out the ram. These machines are practically brand new too, lot of them are being decommissioned because of Windows 11 not being compatible due to TPM or whatever. They run Linux fine and are more powerful than anything I already have while using like 1/10 the power.
I still need to figure out the upgrade path for my NAS though in case I get a hardware failure as it's over 10 years old now, but it's so hard getting server stuff as a consumer now. We lost NCIX and Tigerdirect since I built that box and that's where I used to get all my server stuff. Have not found any other sites that sell that sort of thing at the consumer level. For a NAS I really want a real server with redundant PSU and hot swap bays as it's super critical it stays up since everything else relies on it.