Looking into buying a laptop for gaming

I am looking to buy a laptop for gaming, I am not really a genius when it comes to computers,but, I digress. I am interested in the dv6, mainly because I own one, I know them and what to expect, I love them, I have been searching around, looking into spending around 700-850, I found that two paths look the best for me, I wish to play battlefield 3, even if it is on lowest settings, should I take the combination of the i5-2430m processor and the AMD radeon HD 6770m (also, should I do the 1gb or 2gb vram?), or the combination of the AMD a8 3530mx quad core processor and the radeon 6750m?? I believe that both of these cards from my research can play the lowest setting, but I don't know about the processors, is the i5 a dual core or quad? also, if you guys have suggestions for laptops, please shoot! Thanks alot! Also, sorry for being so bitter and short with this, and sorry if this section of the forum is an irrelevant place to post this, thanks again!