i recently broke down and bought a 17" intel iMac and need to get more ram. i was going to get a 1 gb stick for the second slot for now and eventually replace the existing 512 stick with another 1 gb stick in the future. right now, the computer is for pretty basic things - some web design, xcode, internet, recording. in the future, i am planning on coursework in comp sci and will likely try out boot camp. i also am concerned about the fact that having equal amounts of ram in both slots is better with the intel duos. so is putting a 1 gb stick in one slot and a 512 stick in the other slot a waste? would i be better off just getting 512 right now and having 1 gb total or replacing it and going for the full 2x1 gb sticks?