what gpu should i add to this build?

My current PC:

i5-12400

MSI B760M Pro-M/P DDR4

32GB DDR4 RAM

XPG Pylon 650W

I don't game at all. This PC is strictly for Premiere Pro and DaVinci Resolve.

I prefer NVIDIA.

Considering the current GPU market, what would you recommend for this system if budget isn't an issue?

What's the highest-end GPU that actually makes sense with the i5-12400?

At what point would the CPU become a significant bottleneck?

And would I need to upgrade the 650W PSU for your recommendation?