hey guys! Like many others, I am currently waiting for the 27" iMacs to be released. I just sold my MBP and THunderbolt Display for 1800. The better 27" iMac is 1800 for students at my University. My question is: Should I upgrade to fusion drive right away or just install an SSD myself when I have the money for a 512GB one? Is it even possible to apply it yourself on the new iMacs? Thanks for any answer!