Your CPU is fine for most situations, so I'd hold off on the Mobo/CPU upgrade for now. You can increase your gaming power by getting a new GPU. I'd recommend the AMD 7950 or Nvidia GTX 660 Ti (both around $300). Of coarse you will need to have a decent quality PSU (about 450w or more) for either GPU (I recommend at least 500w). Then later if you feel things aren't up to what you expected, you can upgrade the Mobo/CPU for around another $300 or so (i5 3570k and ~$100 z77/h77 mobo).