Did you already buy the CPU, HDD, Power supply?
Usually the price of the FX4300 is not that far away from the FX6300. I suggest that you get a WD 1TB Blue instead of the Black and use the money saved to get the FX6300 instead.
With regards to the motherboard Asus M5A99X EVO R2.0 http://pcpartpicker.com/part/asus-motherboard-m5a99xevor20
or Gigabyte GA-990FXA-UD3 http://pcpartpicker.com/part/gigabyte-motherboard-ga990fxaud3
I know that you have a low budget but I would like to suggest that you get a different power supply like an XFX Core 650w http://pcpartpicker.com/part/xfx-power-supply-p1650snlb9
or Seasonic S12ii 620w http://pcpartpicker.com/part/seasonic-power-supply-s12ii620bronze.