Also, if you are only intending to play games (web surf and low load productivity tasks) then going with an i5-4690K can save you some money too.
Although if you intend to create video content, stream and what not, then the hyperthreading of the 4790K will be better suited for those tasks.
i would take a look on the Intel Xeon E3 1231v3, 4cores/8 threads, 3,4-3,8GHz, no iGPU, for the price of the i5 4690K. forget about it if you want to overclock your CPU because the Xeon has a fixed multiplicator (but with a Z97 chipset MB you can boost it up to 3,8-4,2GHz).
If you can wait a few weeks, there will be some versions of the GTX 980 and 970 available with double VRAM (8GB).
i´ve also heard that Nvidia will release "Big Maxwell" aka GM200 this year, but more likely it will be available only for the professional GPUs in the beginning. but with the knowledge, that GM200 is going to be released soon, i wouldnt spend ~600$ for a graphic card based on the midrange-chip GM204.