I would still go with the 4790k, I'm running on 5.0Ghz stable (Rare, only the 3rd CPU i got reached that while being stable but most do 4.8Ghz just fine) and The single core performance is amazing!
While the other cores are stressed while gaming (laughable) i still think games today and in a few years are not utilizing more than 2 cores optimally (most i can expect is full 4 core effective usage in 3-4 years).
P.S i run most of these tittles on 4K and 99% of the time above the 60 FPS mark (sometimes reaching 120's), just be sure you are ready to support the CPU with a strong GPU (even SLI/Crossfire) and proper cooling.