Your experience may differ but I have a MacMini setup configured per Steve's recommendations. I use an Audiophilleo with Pure Power USB converter and LessLoss DAC 2004 MkII. I have also heard this set up with a Music Vault server. Both using JRiver. For my money I stuck with the MacMini.
If you want to look into other alternatives than Mac check out Small Green Computer and the servers they sell, as well as Sonore Audio and the SOtM servers.
If you want to look into other alternatives than Mac check out Small Green Computer and the servers they sell, as well as Sonore Audio and the SOtM servers.