RAM is like bass - the more the merrier. Take a look at Mac Warehouse, Mac Zone, Mac MAll and Mac Connection. They usually have pretty good prices on RAM. Also, they may have a bundled deal available that includes extra RAM or some refurbished equipment. If you have a teacher or student in the family, Apple has an education store on their site. At the price you are looking at, it could save you $100 (give or take).