See that's what I'm having some Issues with. I was doing some benchmark things and the AMD eight cores seems to be better than the entire i5 line up but is trounced in comparison to the i7 line.
I'm looking to purchase a gaming rig that'll last me at least 3 years max
What game benchmarks are you looking at? I don't know of any games where the 2 year old FX line has always beat Intel i5 processors.




Also.. the i7 4790K won't give you a higher framerate in games most of the time, the only thing it might help with is minimum framerate. The 4790K is just a slightly faster 4690K with hyperthreading.
http://www.anandtech.com/show/8227/devils-canyon-review-intel-core-i7-4790k-and-i5-4690k/5
http://www.xbitlabs.com/articles/cpu/display/core-i7-4790k-i5-4690k_5.html#sect0
http://www.bit-tech.net/hardware/2014/07/03/intel-core-i5-4690k-review/5
http://hexus.net/tech/reviews/cpu/71265-intel-core-i5-4690k-devils-canyon-22nm-haswell/?page=7