Your gpu makes more difference than your cpu for gaming.
Go to benchmark.net and find out which has the best graphics performance.
On a side note, I just bought my brother the below laptop which is awesome at gaming. Quad core processor, dedicated video HD5650, etc. Check it out cause it performed better than any i3 laptop I've seen...http://www.newegg.com/Product/Product.aspx?Item=N82E16834115864