Which Laptop?

Which laptop should I buy, I am going to use it for school, and watching alot of videos.

[url=http://www.compusa.com/applications/SearchTools/item-details.asp?EdpNo=1159305&CatId=4938][/url] I will add an extra 4gb RAM for $25, so it will cost a total of $525 with shipping.

and

[url=http://www.compusa.com/applications/SearchTools/item-details.asp?EdpNo=1882691&CatId=4938][/url] Which is $550 with shipping.

At $550 you can get a i3 with 520m. http://www.newegg.com/Product/Prod [...] 6834215193
Or
At $500 is a8 which is slightly better igpu than the a6 you posted but still less performance cpu and gpu vs the i3/520m for gaming. The a8 is better for threaded apps and battery life. http://www.newegg.com/Product/Prod [...] 6834246304

You don't need to upgrade ram, 4gb is enough.