When it comes to gaming, I recommend the Intel i5's over the i7's, reason being is that almost no PC game on the market to date utilized hyper-threading and in some games hyper-threading can actually drop your FPS.Were Hyper-threading shines at, is if you do projects such as video editing/rendering, 3D rendering or graphics designing.
I personally have the Intel i5-3570K and the Intel i7-4770K, I also am a big Crysis 3 fan and play the game alot. I honestly can not tell the deference between the two CPU's when playing that game.
I would take the extra $100 you would be spending on the Intel i7 and put it towards a high end GPU. PC games to day are more GPU intensive then they are CPU intensive. The better your GPU the better the game play expanse you will have.