As someone who games on a gaming laptop, I must say this. Is the laptop part nessecary, or do you really need it? Playing a game that gets your fan going, sounds like having a fucking wind turbine next to your head. My screen is also in a state of being half-fucked, which means I have to wiggle it about to get my screen to pop up. Just a warning from experience.
Now about buying it. Don't touch Alienware with a ten foot pole. They will bleed you dry for a meh laptop. Go to Ibuypower [http://www.ibuypower.com/] for a decent gaming laptop. I don't know your budget, but I spent 1,500 dollars and got a pretty good gaming laptop in return. 660M GTX graphics card, 16GB of Ramm, Liquid cooling, and a terabyte of memory. They have sales for almost every holiday. I upgraded to the terabyte of memory for a dollar and twenty dollars to go from 8 to 16 gigs of ramm. They have a Halloween sale going on now, just FYI.