Will the A10-7850k bottleneck a GTX-760?

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
 
Why pay 189 bucks for that 7850 when you can get a 8320 or 8350 for that price and add your 760 you will get far more benefit from that then using the 7850 the 7850 is a apu chip for casual gaming and computing sure you could pair it up with that chip but your wasting resources and power and money even the I 5 are a better option.