I'd like to get an ATV to use in my home theater setup and particularly to rent HD movies and stream from iTunes while ripping my DVD collection. I've seen conflicting information about ATV's ability to do 5.1 sound. I will be passing the audio stream to my receiver via the TOSLINK port. 1. Will ATV pass 5.1 sound? 2. Are HD movies in 5.1? If so, how many (rough guess) 3. If not, is it stricly Prologic 2-channel? Getting HD movies without the 5.1 sound seems like only half of the experience to me.