I think getting AMD FX-6300 CPU and Geforce GTX 760 graphics card will most likely be the best solution for you. It should fit in your budget and you will get good enough CPU and solid graphics card. If you play CPU intensive games or titles that make better use of multiple cores, then you might want to look at FX-8350 and R9 270 combination, but most likely you will be better of with FX-6300 and GTX 760.