what is the largest and fastest HDD around for the new intel macbook 13"? I would like to get a 160gb 7200rpm drive if one exists. I cant imagine that they have larger than 160 gb for our comps. Also how do i know if im buying the right one? Is it any 2.5 SATA drive work? Is http://eshop.macsales.com/item/Hitachi/0A28844/ the fastest and largest around right now?