GTX 1050, 1060, 970 benchmarks

Does anyone have benchmarks for the GTX 1050, the GTX 1060, and the GTX 970 all in one place?

I am considering additional GPUs for my rig and these are priced low, relative to the 1070 and 1080, of course.

Is the GTX 1050 even a contender for running hashcat?

What is the current optimal setup in terms of cost and performance?