What is the common consense when it comes to which processor to get for the new iMac 2017? I'm going for the model with the i5 3.8 Ghz and the Radeon Pro 580. Is it worth also getting the i7 4.2 Ghz? I'm sure I don't really need it but would spend the additional money if it makes the iMac more future proof since it offers hyperthreading and the i5 does not. Does the i7 get hotter than the i5? This is something I don't like if the fans on the i7 would run louder than on the i5.