Are all iMac (Aluminum) refurbs being sold on apple.com used or new? Does it matter? Are they just trying to get rid of inventory or are the majority of these refurbs returns from customers? I'm looking at getting another iMac and don't really see the need to buy the newer model. The discount on the refurbs is really making me lean towards getting one. Does anyone know which is better? I mainly use my iMac for school, iWork, iLife, web, email.