@OP Again,I would stick with your current setup.FX 8320 and GTX 970 can max out any game.If not,high settings is a piece of cake for this setup.
No,the FX-9590 would not bottleneck 2xGTX 970,but it isn't worth it.The 9590 is extremely overpriced,needs more than twice the power a 4690K needs and it melts under the CPU cooler.Overall,a really bad choice.
When you save enough money,do what has been suggested.Get the i5 4690(K) and an H(Z)97 MoBo and you'll be good to go.
@06yfz450ridr Of course they ran fine on an overclocked CPU.OC'd FX 8320 matches the 4690K performance wise.