^ Agreed, but a few other points:
For a full, new, build I'd seriously suggest you spend the extra on a GTX980Ti, it'll last far longer and opens up both VR and Gsync as possible future upgrade options as well as having the power to drive a conventional 1440 display.
Your timeframe is very important here, Nvidia should have some Pascal parts available by June this year so holding off, at least until we get some solid benchmarks in for these new parts may be your best option.