Hi, I'm looking into purchasing a new iMac and in my search around i found a 3.4, core i7, 27-inch iMac (from October 2012) refurbished. It has the 1TB fusion drive which i was also looking for. But, it only has 8 gigs of RAM. I was looking to get 16. Online, it says the iMac has 4 RAM slots, two of them unoccupied. So, would I be able to purchase this mac as well as the RAM linked below, then install it myself? http://eshop.macsales.com/item/Other World Computing/1600DDR3S08S/ The iMac I'm looking at.. http://store.apple.com/us/product/G0MS5LL/A/refurbished-27-inch-imac-34ghz-quad-core-Intel-Core-i7 Thanks for the help. I need to confirm this so i can decide between this or a newer 21" 3.1, core i7 with all same other features.