If I get an apple it'll have to last me a long time. It worries me the way Apple likes to outdate stuff constantly. How long do Apples usually stay up-to-date on the market? I'll be getting a 15" Powerbook with max everything (except just 1GB of ram) and can always do some small upgrades (such as more ram in the future). PCs are very good about working for long times. What about Macs?