I wrote today about the fan with Abbas and asked if a 60mm fan will be enough in the summer at warm temperatures. I also asked about the noise level of the Noctua fan. Abbas writes that this fan is very quiet and sufficient for warm temperatures in the summer. I proposed to Abbas to use a fan shroud decoupler, he says that the vibration is so small that it isn't necessary.
As for the alternative to Noctua fan, there is no better fan in 60mm. Be Quite has no fans in 60mm. The only notable alternative is the Noiseblocker with 2500rpm. The Noctua is available as PWM 1600-3000rpm and without PWM 3000rpm model. The quality of Noctua is unbeatable, I have tried them all in my PC and use mostly Noctua, but also Noisblocker and Fractal Design as case fans in places.