You got good advice from lightjack. Let me add a bit....
Laptops for gaming is a lousy idea. The reason is primarily heat. Everything electronic produces heat. If that heat grows to large, it can seriously damage the electronics, if not ruin it. So, engineers who design these devices work hard at designing for heat dissipation. Laptops are very confined spaces and just don't lend themselves well to heat dissipation. In fact, if you study the processors Intel designs for laptops, they are very different. They tend to be slower in order to generate less heat.
So, if you want to do gaming, a desktop design is the right place to do it. That also gives you a lot of advantages in flexibility to pick and choose components. Most serious gamers, design and build their own desktop PCs. Don't get scared when you hear that. It is not at all difficult to do.
Desktops are faster $ for $, and their maximum speeds way exceed practical limits in laptops. Desktop lifespan is also quite a bit longer.