If i were you i would stick with the 1060. You wil not get 75 fps in most AAA titles, but if you are into playing Mobas (LoL,Dota Overwatch), or CS:GO, a 1060 would be more than sufficient. However, a 1060 will run the witcher 3 at 50 fps in 1440p on ultra if you have a good processor.
Turning down graphics from ultra to high will make most games playable at 75fps.
I would not recomend spending hundreds of dollars to get games from 60 to 75 fps, and i think you can safely buy that monitor you are looking at.