If your not willing to use a AMD grafics card then your pretty much stuck with the gtx 970. Since you budget is a little to tight for the 980ti and the regular 980 has a terrible price-performance-ratio. But this clears up room to get a decent looking case with awesome air flow, so that you dont have to use watercooling in order to overclock the i5 and you can go with a larger sized SSD which is very confortable.
But if you want to get the best performance possible for your budget i recommend going with a cheaper case and getting the AMD R9 390X.
http://pcpartpicker.com/p/yjQYVn - Base Total: $1250.56
Be carefull if you want to change the case, since the cooler i chose is larger then what many mid-tower cases can support.