From what I can tell, the only difference in the high end 2.2 Ghz Macbook and the low end (2.2 Ghz) Macbook pro is the graphics card and the base ram/HD. Is that correct?? Also, am I correct that the high end (2.2Ghz) white Macbook and the Black Macbook are identical except for the base HD in the black one (which can be upgraded in the white one). I calculated the price and it seems like the white one is $130 cheaper than the black once you upgrade the hard drive to 160 GB. Is it true that you pay extra for the color with the back one?