As you have not mentioned any of your budget limits so i would take it as their is no boundries and limits.
From years Alienware company was and still a king for producing gaming laptops but beside that you are also right the Razers are heating up the market very fast.
Coming to the point - Alienware 17 will be an excellent choice as the name itself defines
its got the specs so high that even a high ending games like assasins Creed black flag or crysis 3 or nfs the run can be played in ultra high settings. alienware 17 has extended battery life too.
Features - Up to 4th Gen Intel® Core™ i7 processors
OS Windows® 8.1 (64Bit)
Memory Optional NVIDIA® GeForce® GTX
880M graphics with 8GB total GDDR5
3D Optional 3D display for an...