So looking for an ATV. Probably the 3 now as its here and i would like 1080 etc .. Anyway .. was looking at JB'ing for Plex and then i just found this firecore thing? What is it and how does it work? - Will it stream MKV's from my Mac in 1080 to the ATV straight to the Movies app? - along with artwork etc? What else does it give me .. I'm very new to this!