If you even get a choice, you can't build a hotrod gaming laptop. Your best bet would be to go for a Dell Inspiron 8200 with "64MB DDR 4XAGP NVIDIA GeForce4 440 Goâ„¢ 3D Video".
While there's a wide array of complex and fancy projects you can make with a Raspberry Pi, one of its most practical uses is as a desktop computer. Sure, it may be small, but it's pretty much capable ...