Hi I am thinking about buying a 1.6 Ghz macbook air rev A for A$ 700 because I really like its form factor. Normally I use Macbook white 2.0 Ghz with 2 Gb ram and GMA 950 for most of my university works. So I am wondering about the speed difference between them for word, excel, internet, matlab and maple. I only use my macbook for these applications and also watching movie from my external harddrive. any comment would be appreciated.