ASUS M5A99X EVO or ASUS M5A99FX PRO. Whichever one is cheaper,get it.
For gaming,an i5 will beat a FX-6300.
If I was interested in gaming only,then i would get an i5 4690K and a Gigabyte Z97-HD3 mobo or a i5 4690 and a AsRock H97 Killer mobo.
But if you're on a tight budget,the FX 6300 and a M5A99X EVO mobo will do just fine.