Hi Im a newly converted Mac user. I have been downloading high def 1080 AVI formated movies, I am able to watch the movies via Quick Time on my computer but i am interesed in uploading the movies to Itunes so that i can access them via apple tv. How do i do this? If converting is necessary, will they still be in high def 5.1 surround sound format? Although I like what apple tv offers, i-photo, i-tunes, I have not yet purchased it. Is there a better system? Suggestions or directions in 3rd grade english would be appreciated.