I'm finally biting the bullet and ordering an iMac and I would love to save money by settling for the i5 and 675MX. Can any experts advise me on how significantly I would gain in real-world use by paying more? As per the thread title, I plan to use Cinema 4D and FCPX as my main applications. If there would only be a marginal improvement (eg. slightly quicker renders) I'm not sure it's worth it. But if those apps would really struggle with the cheaper options, that would be a different story. Thanks in advance!