I really want the new Imac 27" with 3.4Ghz i7 and GTX 680M, and upgrade/change the Memory and SSD by my self to keep it cheap as possible. Do you think it will be possible to change the standard 7200 hard drive with a 256GB SSD? I have all my storage on an USB hard drive, so I dont need the fusion drive and the 768 SSD is too expensive.