I plan to buy the iPhone 4S and will take many pictures with it. The only computer I have right now is a family-shared iMac, and I plan to put all the pictures/video I take with the 4S onto it. In the future, when I get my own computer, I will want some things (like iTunes music, pictures, videos, etc.) transferred over. How would I do this? Again, it's very important that I only transfer the specific things I want, not a whole boatload of stuff that the family has saved on there.