I see that the ATI card system has a core i3 , thats much more efficient than a core 2 duo as far as i know with shared l3 cache etc and a 32 nm manufacturing process.
On top of that , its cheaper than the Nvidia.Why would you go for the more expensive one ? Game performance is better for some games on nvidia and favours ATI for some.But i think you have to look more into other features too since its a laptop.Also the ATI one has a smaller HDD so you decide.
For graphics card recommendations , i follow this chart
http://www.tomshardware.com/reviews/...deon,2646.html
Its a very good series and i have always used it to buy my cards,Some 4 years ago i got an nvidia 7600 GT, and after recent reading i got an ATI 4850.
But today, it doesnt make much sense to buy Nvidia since ATI offer similar performance at a lower price.
Those charts are for desktops but you will have a rough idea from them, also in the end there is a huge list of comparable cards which includes mobile chipsets also.
Also final thoughts, since this is a laptop ,i would recommend getting a nice big screen and some good inbuilt speakers.
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