Remember that the CPU is the heart and soul of you PC, almost everything must be processed by it therefore it is always worth to get the better CPU, Intel CPU's are great for gaming while AMD CPU's are great for the average user, video editors and people who renders stuff. I would honestly get an Intel, maybe the i5 3570k or as you mentioned the i5-4690k, Xfire is also very buggy still and wont drasticly improve frame rates in Games and such (assuming that's what you are doing) same goes for the CPU, you wont see an massive spike in frames with a new CPU, but you could avoid serious CPU lag spikes if you upgrade. I myself have a i5 3570k and had a r9 270x, I ran games like Battlefield Ultra 60fps+ no problem.
Good luck with the decision...