I cannot think of one game that the 4690k cannot handle with the best GPUs on the market. The only time a 4790k will come in handy over the 4690k (when gaming) is if you decide to stream/record your game play (aka, real time rendering while gaming).
I use the 4790k (4.7ghz) to game and record, but I also do other things that require the additional threads. The 4690k would be great for you if you plan on gaming only (it will still handle everything else just fine, it is a top tier CPU).
I see you currently have a 8370, if that is currently bottlenecking you, the 4690k will easily take care of that.