If it's only for gaming, go for an AMD CPU. Preferably an 8350 or 8150. I have an 8350 in my rig, and I got it stable at 5.0GHz. Also, i've seen in benchmarks that it outperforms the i7 3570k and 3770k 9 times out of 10. GPU wise, go for a GTX 660 or 760, depending if you can afford it. RAM I would go for Kingston HyperX. It's 1600MHz, which is optimal.