Cas Latency VS Speed

Building a new computer for a friend (who will use it primarily for gaming) and wondering which pair of sticks will give better performance if any at all.

1600 Mhz @ 9 Cas Latency

 http://www.newegg.com/Product/Product.aspx?Item=N82E16820148544

1333 Mhz @ 7 Cas Latency 

http://www.newegg.com/Product/Product.aspx?Item=N82E16820148485

What will you be doing other than gaming? The difference between the two is literally half a frame (if that) when gaming.

They will be just browsing the web, homework, music, movies, and ect. Nothing that really takes performance other then gaming

In that case, I would go for the 1600 Mhz ram, as it is a few dollars cheaper and looks better aesthetically in my opinion.