Here is the link to purchase 2GB for $70. I forgot to mention the MIR.

Unfortunately, I am returning my 20" Imac due to a buzzing noise. I bought as a refreshed condition from a mac store and notice a buzzing noise from the back of the imac like an aquarium water pump sound...really annoying when the room is quiet. We have a 17" Imac and it's very quiet...

http://www.newegg.com/Product/Produc...82E16820145048