Best GPU for: ArchViz + RayTracing + Movie Rendering - Not for realtime

I am creating photorealistic archviz using raytracing(brute force/path tracing) and I will be rendering the animation with high anti-aliasing and sub-sampling through the new movie render queue.
I am looking to get the Best graphics that can render and visualize the project.
However, I have no intentions of doing any real-time interactive walkthroughs.