I'm looking for a 1 gig stick of ram for my powerbook (1.5, 15"). I have the stock 2x256 sticks in still. I want to remove 1 stick of 256 and put a 1 gig stick in instead. I looked at crucial and it seemed a little weird to me that they charge 92$ for a stick of 512 but they charge almost 400$ for 1 gig. Does that make sense? Can anyone recommend something?