I have a 2006 C2D iMac (first gen of the aluminum ones) that is getting sluggish and I am eyeing up the MBPR. This will be my second Mac and I'm thinking about using migration assistant to move to the new computer. For iTunes all my media is on an external drive. I'm assuming if I do migration assistant and reconnect the external drive to my new computer it will all transfer over? For iMovie all my events are on an external drive. I'm assuming the same thing as above for iTunes? I use Aperture for photos. My whole library is on an external drive. I'm assuming the same thing here as well?