I currenty have a 4 year old 1.5Ghz 12" PB and looking into buying a white MB with the 250gb HDD, 4gb RAM from newegg and was wondering if this would increase the video performance of the MB as the GMA chipset uses system memory. I remember reading somewhere that it takes a much memory as needed if available? Is there someway to force it to dedicate a particular amount of RAM for graphic use? Also how do people coming from a 12" PB feel about the size, weight and feel of the MB? And is there a significant difference between the LED backlit displays and the MB ones? Thanks!