Do you know what does the video/animation program uses for it's heavy crunching? If it's CPU, and the program can take advantage of hyperthreading, i7 could have a significant advantage over i5. But if it uses the video card, the 5850 will be king (assuming you can even find one for sale at this time). Also, make sure you include enough RAM regardless.
__________________ i7 2600K | ASUS Maximus IV GENE-Z | GTX Titan | Corsair DDR3-2133
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