I'm looking to get a new Mac Pro for work, primarily for graphic design and motion graphics. I've got the low end Pro at the moment, but it's not great when it comes to rendering video in After Effects. My question is which upgrade would be more beneficial - more cores, or better graphics cards? I've tried rendering with and without multiprocessing, and it yields roughly the same results. My understanding is that more cores would speed up the multiprocessing, but is that worth the huge price difference? Does the slower clock speed also have any impact on AE?