I can't get Pure Wings (any) in my country, seem to be often out of stock.
The market choice is limited, in addition to the headache of choosing the fans.
What about two Noctua NF-F12 industrialPPC-2000 IP67 PWM, 1 the front(top) and 1 in back (using stock for the HDD cage one)?
Then, some time later, I'd add an NF-A14 for the front-top fan, and put down the NF-F12 to the bottom, instead of stock fan.
I'll explain my desire for airflow on the front-top fan: it's in the middle of the long-ish case (Masterbox 5), where there are no obstructions except of videocard itself.
P.S. I admit, the reputation for quality of Noctua fans seems very alluring. If only I'd built a brown PC.