Hi All I'm considering a possible 3GB RAM configuration because I plan to use Aperture. From what I understand, the new MBPs come with two ram slots, and each slot is already occupied by a 1GB RAM stick. True? So, if I want to upgrade to 3GB in the near future, I suppose that would mean removing one of the 1GB sticks and replacing it with a 2GB stick. Is it more economical to do this upgrade upfront? I just want to make sure I understand that both slots are occupied in these new models. thanks!