If you're going to use the discrete GTX 760 just get an i5, the 7850k is designed for those who only want to use the APU (the R7 graphics that comes with the chip)
But to answer your question, in most games it shouldn't hold the 760 back too much compared to an i5
Your best bet would be to go for an i5 4430 or 4440, they'd give you the best overall gaming experience