I see many post about the advantages of getting the 2.66 with more over the 3.0 with less RAM. I was wondering say you have to stay on budget and you can only spend an extra $300 on upgrades, is it better to get that in RAM or on the x1900? I am using this Mac for Photoshop, Maya, Cinema 4d and After Effects/Motion work. I know thee are all RAM hungry apps, but they are also apps that require big video card needs. Also, could I buy any old x1900 off of the shelf and slap that in my Mac in a few months or so? Thanks.