Hi, I am looking at getting the late 2013, i7, 16gb, 3tb fusion, gtx780m iMac at a good price with applecare. It's 2nd hand but just few weeks old. Should I take the plunge (as I don't want to buy the retina version and pay more) or is there going to be imminent spec bump/upgrade of the regular iMac's ? Will apple keep the 27" line with the current Nvidia chips or will they put AMD ones or perhaps 9xx version of latest nvidia's chips ? Cheers.