There's never one simple answer for that kind of question but:
List of supported cards for Ray Tracing 3D in AE you will find here: After Effects System Requirements for Mac OS and Windows
More info on that from NVidia: Adobe After Effects CC - 3D Graphics Workflow|NVIDIA
But to be honnest most of nvidia graphics cards will work with AE - simplest rle is - the more Cuda cores the better.
But before you will spend lots of money for top GPU know that AE uses mostly CPU for rendering so GPU is not so important. It uses GPU only for RayTracing (obsolete)
and some third party plug-ins.