I am getting the HDD on my iMac replaced and I need help making a decision. I am replacing the existing and standard 320GB HDD with a 3TB HDD. My two options are: 1. Get it replaced at the Orchard an pay $95 total for the replacement(which includes cloning of the original drive) but wait about 4-5 days for my computer to be finished. 2. Get the BestBuy Geek Squad to do the replacement for $50 and have it done the same day, but then do the OS reinstall myself. I would like to clone my original drive so that I don't have to deal with installing snow leopard and then Lion after that, but what is involved in the process and would I need an enclosure for the original drive? If I can easily do it myself, then I think I would prefer that, because I don't want to pay the GeekSquad the extra $130 for the OS install. Thanks in advance for any assistance.