Hi Dave,
I use a lot of 3D Software (Maya, Max, Blender, Cinema4D, DeltaGEN).
And obviesely rendering.
I had in mind to get a min. of 16gb maybe also 32gb RAM.
But I had no Idea what kind of grafic card or CPU I should get.
And After effects has a bit more Focus thats why it was for me more imported to get somethink for After effects.
Mohammad