Overclocking CPU - What Ram should i get?

I plan on overclocking. My build will consist of:

cpu - intel allendale E2160 1.8ghz
mobo - GIGABYTE GA-P35-DS3L
vid card - MSI NX8400GS-TD256E GeForce 8400GS (256MB onboard) 64-bit GDDR2 PCI Express x16

Im confused on what ram to get. There are so many choices and im fairly new at this. Can i get away with just overclocking the cpu and not the ram?

Im looking at these= http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...