Since my 2011 macbook air is doing so well, I have decided it is not necessary to upgrade it. I am looking into purchase an iMac. I only plan to use it to watch some movies and back up some photos. Hence, I think low ram and low speed is fine. The only thing I need is better storage space. My question is SSD upgrade. If I purchase iMac 1.4ghz with 500GB ATA storage or 3.2ghz with 1TB ATA, can i upgrade to SSD? Or I have to pay the extra $200 for the 256GB flash to make it SSD upgradeable?