Hi! So, I need your help with buying a new iMac 27' nonRetina. The problem is that the nonRetina models do not have the upgrade option anymore, so my choice is fairly limited. I am finishing my masters of architecture the next year and have started to work at an architecture firm, where I am working on rendering in ArchiCAD, Artlantis, Cinema 4D.. Currently I have a late 09 iMac 24', which screems for an upgrade. I have two options: 1.CPU: i5-4670 3,4GHz RAM: 16 GB HD: 256 GB Flash GPU: GeForce GTX780M 2. CPU: i7-4771 3,5GHz RAM: 16 GB HD: 256 GB Flash GPU: GeForce GTX775M Should I go with the better CPU or rather with the i5 and better GPU combination? Which would be better for my kind of work? I do not want the Retina for various reasons. Thank you very much for your help, I do appreciate it very much.