Here my thoughts:
- Only get PWM. DC controlled 3-pin fans cant go as low rpm as PWM.
- The 92mm exhaust is a waste of money. I am 99% sure there will be no temp difference with it running as the case has plenty of exhaust holes in the top of the case. Save the money!
- I am no AIO expert. I read somewhere pull is better on the NCASE M1 so that you could clean the dust from the other side when required. The side panel dust filter doesn't stop all the dust and having to remove the fans before you can clean the radiator is surely a pain!
- the rest sounds good. I have 1x120mm and 1x140mm at the bottom. One is fixed with double sided foam strips and doesn't move.
I have a rear exhaust fan on my setup, I'll try to do a quick test tonight see if I get a difference in temperature