Solved! Which of these is the best laptop for its price?

[JekkoJ4Y]

http/www.staples.ca/ENG/Catalog/cat_sku.asp?CatIds=&webid=343076&affixedcode=WW
ASUS K53TA-CST1-CBIL: $599
2.3GHz AMD Quad-Core A6-3400
4GB RAM
1GB AMD Radeon HD 6650

http/www.canadacomputers.com/product_info.php?cPath=710_577_371&item_id=040902
Acer Aspire AS7750G-6871: $699
Intel Core i5-2410M
6GB RAM
1GB AMD Radeon HD 6850M

http/www.canadacomputers.com/product_info.php?cPath=710_577_371&item_id=039060
Acer Aspire AS7745G-9445: $799
Intel Core i7-740QM (1.73GHz)
8GB RAM
1GB ATI Radeon HD 5850

http/www.costco.ca/Browse/Product.aspx?Prodid=10353327&search=asus&Mo=17&cm_re=1_en-_-Top_Left_Nav-_-Top_search&lang=en-CA&Nr=P_CatalogName:BCCA&Sp=S&N=0&whse=BCCA&Dx=mode+matchallpartial&Ntk=Text_Search&Dr=P_CatalogName:BCCA&Ne=4000000&D=asus&Ntt=asus&No=9&Ntx=mode+matchallpartial&Nty=1&topnav=&s=1
ASUS A53SV-XC1-CBIL: $829
Intel Core i7-2630QM 2.0 GHz
8GB RAM
1GB NVIDIA GeForce GT 540M

I'd be mostly using the laptop for school and medium gaming. All these laptops seem proficient for both, but some input from a more experienced community on which is the best for its price would be great.
If you find a better laptop for around the same price range, by all means, post it; however, keep in mind that I live in Canada and personally, I don't like purchasing online because of all the hassle that comes with it if something goes wrong with the laptop.
Thanks for your help

 

[Maziar]

In terms of gaming,the second one will give you the best performance