If you liked iTunes, and you want it Mac based, then your decision is easy, get a MacMini and call it a day. With it's HDMI port, the new one is basically designed to be a media server.
M80v2 | VP150v2 | QS8v2 SVS Pci+ 20-39 Emotiva UMC-1 & LPA-1 M22ti + T-Amp, in the Office