The i5 4690K will last you a long time if you are just gaming. And if for some reason it did not perform as well years down the road, you can still upgrade to the 4770K or 4790K and it will fit in the same socket. Intel CPUs are continuing to get better and already out perform AMD processors in both single and multi core processing. AMD has not kept up with innovation of new designs, they have just gone back and made their older ones more power efficient for power savings.
Disclaimer: I own both brands of CPU so I know the differences. I do favor Intel, but do not consider me a die hard fan boy for either.