Efficient gaming laptop?

I'm looking for an efficient gaming laptop with Broadwell U i5 or i7, combined with 850M, 860M Maxwell or 950M, 960M GPU. The rest requirements are here;


What is your budget?

• Up to $1000

2) What size notebook would you prefer?

• d. Mainstream; 15" - 16" screen

3) Where will you buying this notebook? You can select the flag of your country as an indicator.

• USA

4) Are there any brands that you prefer or any you really don't like?

• ...

Efficient gaming laptop?