Asus Best Gaming Laptop under $800

[smokeydude]

I have been looking for a good solid laptop for school and some gaming and so far i found no better value than Asus laptops on Newegg. but now i am stumped on what exactly exactly is right for me so found 3 solid laptops priced at $680, $780, and $880. Each with one solid step up on the other.
Here is a Newegg comparison:
http/www.newegg.com/Product/Productcompare.aspx?Submit=Property&N=100006740&IsNodeId=1&Manufactory=1315&PropertyCodeValue=402%3A94427%2C402%3A103495&bop=And&CompareItemList=32%7C34-230-132%5E34-230-132-TS%2C34-230-133%5E34-230-133-TS%2C34-230-143%5E34-230-143-TS

$680 ASUS A53SV NH51= i5-2430M Nvidia gt 540m
$780 ASUS A53SV-NH71= i7-2670QM Nvidia Gt 540m
$880 ASUS N53SN-EH71= i7-2670QM Nvidia Gt 550m

So which offers the most for its $100 price increase and should get me the best bang for my buck.

 

[nero912]

http/www.newegg.com/Product/Product.aspx?Item=N82E16834158058 808$

have better GPU, HD 6770m

http/www.newegg.com/Product/Product.aspx?Item=N82E16834230111 870$

have even better GPU, GTX 460m