Best gaming comp under 3k?

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Best gaming comp under 3k? I have been looking at alienware and sony so far. i really like the alienware for its speed and the things it give, but i wonder if i can get the same for a better price. i want a laptop for under 3k within he most performance possible. fastest processor, most ram, best video card, and screen must be 15" or lower. o yes, it must have decent battery life.