You could get the FX 6300 along with an r7 260x: you'll see a pretty big upgrade. However, you really should upgrade the PSU to an EVGA 500B power supply: the one I saw in your system is crap. Otherwise, getting an aftermarket cooler like the Hyper TX3/T4/Hyper 212 Evo and an 120GB SSD would be a good upgrade.