Alienware is no joke. I know a lot of people think it is, but don't believe them. My Alienware laptop runs WoW and LoL both at 60+ FPS. It also manages GBA and GBC ROMs efficiently.
Did I mention Civ 5? It does that at something around 50-60 FPS. Incredibly surprised considering how graphically-intense Civ 5 is.
To hell with building my own PC. My PC with a 980ti/Intel i7 can't hold a candle to my Alienware. People tell me I've visited too many dirty websites. HA! I visit just as many if not more on my Alienware. No problems.