If you are working on image rendering, animation and modeling the more cores the better.
An 8 cores CPU and 16GB RAM minimum. If you are working on complex scenes 32GB RAM minimum.
NVIDIA Quadro or GeForce GTX 660 or 1080 depending on budget.
A SSD to host the OS and the apps (Auto cad, Photoshop and 3d max).
What's your budget?
Are you building it?