What should I look for in a Mac Mini for a HT computer? I just want to play converted movies, either direct through HDMI or streaming to my Apple TV. Is the processor/ram going to be critical? I'm thinking used of course, but is the air play a decent way to go if I get a new/newer one? All my HDMI ports are full on my TV, but it seems like AirPlay is maybe not the best option, and I'm not even sure a Mac Mini can o AirPlay.