What should i upgrade next on my pc?

This would be my build http://pcpartpicker.com/p/jTjqyc or this http://pcpartpicker.com/p/8hY2NG, honestly i dont think changing ur cpu worth it right, u can overclock your current one without any problems.

EDIT: Here s the proof http://www.anandtech.com/bench/product/699?vs=697, scrool down to the last 3 or 4 becnhmarks, those are gaming benchmarks, the difference is very small bewteen fx 6300 and fx 8350, so it doesnt worth it, better buy a single better gpu to avoid cross issues (some games doesnt support cross so your fps will be reduced to half, or doesnt fully support cross and u will have about 10% improvment over your single 270x)