You could go for this build:
http://pcpartpicker.com/p/3x0IQ
It has decent specs, but it would be best if you could spend an extra $50 to go for the r7 265. Its a great deal, and much faster than the r7 260x. Other than that, you could change the case depending on what you like, and the memory depending on whats the cheapest 8gb kit available.
My rig is very simmilar to this, except i have a hd 7850, which is basically the r7 265. I can play lol flawlessly, and pretty much any other game.