I have had several shutter failures with the D750. And I am not alone.
I have grown so disenchanted that I eventually replaced mine with a D500.
I am not saying the D500 is a camera you should be looking at, but here is my opinion:
If you are not interested in AF at all, get the DF or maybe the D610 (same sensor as D750, but cheaper)
If you are interested in AF, wait for the D750's replacement, and, assuming it has the new 153-point system, get that. It is at least as much better than the 51-point system as that is better than the 39-point system in the Df and D610.
If that is too expensive, consider a D810.