There yah go ...
The HD 7970 has already fallen below $300 these days -- no telling where it will be come October.
This is an odd time in the GPU wars, too. AMD has been sitting on "Tahiti" since early 2012. nVidia released Kepler 4 months later, and then the refresh this Summer -- the point being, it's almost like AMD was waiting to see what nVidia cooked-up, and will tweak Volcanic Islands accordingly.
The bottom line is ... another crater in GPU prices, and new models to salivate over (especially if the rumahs on the internets are to be believed).
No doubt, you will get a great deal more bang-fer-yer-buck come October, and an even better selection of hardware to choose from ...
edit: Haswell ain't all that ...
The FX8320 is $145 this weekend, and will easily OC within 100MHz or so of the FX8350 -- at a price $95 less than the i5-4670K.
It ain't gonna pump 67% more frames in BF4 than the FX8320 ...