I am thinking of getting an iMac and getting all my content on it from iTunes like music, movies, and more because it's got such big storage capacity. I then want to be able to sync specific sets of content to different devices. For example, all my music to my iPhone, all my action movies to my iPad, and all my comedy movies to my Macbook Pro. How do I go about syncing different sets of content to different devices all from the same iMac? And, is this a good way to manage my content?