I realize that you have said your max is $1400...but if you could somehow scrape up another $100 you can get the latest Asus (or MSI) for $1499 with the newer GTX 970M in it...and the jump from the 870 to the 970 is a pretty good jump. The Asus for $1499 is the G751JT-CH71 (
http://www.newegg.com/Product/Product.aspx?Item=N82E16834232202).
If you had to pick between the older ones that you have listed, I'd definitely pick the Asus myself. I've had two of the G75X series laptops in the past and the cooling is awesome on them. As someone who actually games with my laptop on my lap (novel idea, I know) that's a huge benefit to me. It also keeps the components cooler which prolongs their life.
I was also considering the new MSI for the latest rev because Asus's keyboards have always just been okay and the steel series keyboards have great reviews. I just couldn't overlook the awesome cooling that the Asus has. I hear that the new model MSI's have done much better because they've gone form the single fan to a dual fan, similar to the Asus.