Go for either the:
ASUS ROG G750JM-DS71 see here > http://www.amazon.com/...00IKF2H12/
It has:
Intel Core i7-4700HQ 2.4Ghz (Turbo 3.4 GHz)
12 GB DDR3
1 TB 5400 rpm Hard Drive
17.3-inch screen, GeForce GTX 860M 2GB
Windows 8.1, 3.5-hour battery life
or the MSI GT70 Dominator-895;9S7-1763A2-895 17.3-Inch Laptop
see here >http://www.amazon.com/gp/product/B00IMTQ6I6/
Its specs are as follows:
Intel Core i7-4800MQ (2.7 GHz, 6 MB Cache)
8 GB DDR3L SDRAM
1 TB 7200 rpm Hard Drive
17.3-Inch Screen, NVIDIA Geforce GTX870M with 3GB GDDR5 VRAM
Windows 8.1
The MSI is the better of the two for gaming. Why? It has a better graphics card than the Asus> To be specific- it has the NVIDIA Geforce GTX870M with 3GB GDDR5 which is better than the GeForce GTX 860M 2GB the Asus has. It also has a better processor than the Asus. To be specific> It has the Intel Core i7-4800MQ (2.7 GHz, 6 MB Cache) processor while the Asus has the Intel Core i7-4700HQ 2.4Ghz (Turbo 3.4 GHz).
Nevertheless. They are two excellent gamers. You said your budget is $1400, so go for the MSI it is sold for $1399.
Enjoy gaming.
And be sure to inform me after you have bought it and start breezing through the latest games on maximum settings.