If you want Open GL accelerated rendering in After Effects of the Ray Traced rendering feature you have to go with Nvidia. The recommended graphics cards are on the Adobe Site and there are dozens of threads on this forum, some with great links to card comparisons. I'd do a little research and then come back with specific questions.
Ok here are a more specific questions:
Knowing that my CPU is not that fast should I go for a fully supported Quadro 4000 rather than a hacked GTX570 if they go for about the same price second hand?
Also Rick I read on what of your posts that you have a mac; what card do you use?
My mac that supports Ray-tracing is a MacBook Pro retina display. My other mac's don't have Nvidia cards yet. When I upgrade I'll check the spreadsheet with the render times that's listed in my other post. I'll pick the best bang for the buck not the fastest card. The Quadro 4000 isn't a good buy right now according to the research.
I recommend a GTX 5xx or 6xx over a Quadro. Better bang for the buck, as you can see from what Rick pointed to.
Ok Thanks for the help, GTX 570 it will be.
Is there any chance that the next version of CC would make it impossible for me to have CUDA enabled in after effects?