I personally own a white macbook and a black one. I accidentally smashed the screen on the black one so now I think of it as the best Mac mini there is
Of the two, the BLACK ONE shows marks, smudges, whatever the best. The keyboard is the worst part to clean off. For some reason especially the palm rest and trackpad it is hard to get rid of the hand grease. Eventually you learn to live with it.
But to clear off everything else, a damp warm microfiber cloth always did the trick.
And the GMA950 should be fine for Leopard. The thing isnt too demanding
