I am buy a powerbook no matter what but I am having trouble deciding whether to get the 5400 or 4200, money is not a problem either way. I need the computer to last for as long as possible, but I also would like the battery to last for as long as possible. I dont know if the scrafice in battery life is worth additional longevity in its lifespan. To complicate things, I need the computer delivered by October 9th at the latest, so I do not know if I should just order it with the 5400 now, or wait till more information about models with the 5400 are released. What do you think I should do?