Recommended fans for Pro Pioneer / Pro BE

I read some old threads but there are so many fan model variants of the recommend Noctura and other brand fans I thought I would post this as a new question.

I am looking for replacement CPU & case fans for my Pro Pioneer 6 bay unit.  My understanding is that quieter models exist versus the factory fans.  I need to change my power supply so while inside I figured it's a good time to change the fans.

Thanks