i am trying to decide on which PowerBook to get and was wondering what people thought of their Powerbooks (Aluminum Models). i also had some questions about the powerbooks. 1.does the 12in make you go cross-eyed after a while? 2.how portable is the 15in model? 3.is the 17 in just too big to carry around? 4.is there a big difference between 1.5ghz and 1.67ghz? 5.how is the screen quality on the Powerbooks. 6.how are the graphics? 7.is the ATI Radeon 9700 a better video card than the NVIDEA card found in the 12in Powerbooks? 8.how is the backlit keyboard thanks in advance for any input.