My home server is basically my old laptop. It is a Dell Latitude e6540, just sips power when not under heavy load.

with a 4 core i7 and 16 GB of ram, it is more than enough for home use.

for storage, it has a m.2 SATA ssd for the root partition. And 2x 2tb hard drives that are raided with zfs for the home and network share folders.