The ultra small form factor PCs that have become popular in the business market are honestly great for this. Many times they're using laptop CPUs, which significantly shrink their TDP, leading to less heat waste and power consumption while still having all the good accelerators folks desire for many homelab concerns (video codec accelerators for home media servers, VT-x/d for virtualization acceleration, etc). Grabbing three of those and installing a healthy amount of local storage and RAM and/or using a NAS for decentralized storage will get most homelabbers a real long way to doing nearly anything they want to do, and allow for simple and reliable high availability configs if you're like me and your homelab projects suddenly creep into being production systems.