I would just recommend looking at http://www.xoticpc.com before going the BYO route, as they build primarily gaming systems and gaming laptops. Don't buy anything you can pickup at bestbuy or Amazon if you want to play games, as the build quality is terrible on anything less than 1000$, and I would actually suggest getting at least a nVidia 1070 GTX if you want to keep it for a few years.