I am thinking of buying Apple TV. I have two iMac's on a ethernet LAN in the office, but I wanted to get all my iTunes and movies to my TV which is downstairs. I do not want to extend my LAN downstairs, nor do I want any wireless connections. If I buy Apple TV can I add it to my LAN upstairs to sync with iTunes and movies and then take it downstairs and have it work from it's internal disk only? When new data is added to iTunes, just take the unit back on to my LAN and make a sync, will that work? Will the ATV function OK if it is isolated from the iMac?