I wouldn't consider $1400 worth of GPUs driven by a $220 CPU ... especially knowing that the platform (MoBo + CPU) normally outlasts the GPU (my old PC had the GPU upgraded 3 times keeping all the rest).
So my advice: the i5-4690K is really the best gaming CPU at the moment (i got one myself a month ago), but that could change in the next year or two with heavy games coming and as others mentioned above, some games can saturate an i5-4690K even today.
Get at least an i7-4790K or even better, a six-core socket 2011-v3 CPU with corresponding motherboard to serve as a platform for future upgrades.
If money is a concern, an i5-4690K + single GTX 980Ti is an excellent base for a gaming PC today and in the next year or two. I have an...