i have a couple of apple tvs (a 2nd and a 3rd gen) in the house. i have a fairly large movie collection on an external hard drive, but i don't want to put it in my main itunes library (what i do right now is add a select few, watch them, delete etc.) but i'd like to run a second instance of itunes when i'm at home to allow me to stream *all* of them. what's my best option without taxing my rMBP too much? i'm was thinking of my old copy of windows XP in parallels - can i pare the settings right down so it runs in the background without me noticing a hit on the computer, but still performs well enough for streaming movies? has anyone else done anything similar?