I have owned my 2.4ghz 13" MBP since the April refresh, and it is a fantastic machine, it was my first mac and I will never use a windows laptop again. I have started to think about the eventual refresh to the notebook line. I would like to keep updated with the latest models, at least every second refresh or so. What is the cheapest way to do this? I am hoping that if I am savvy and choose the right times to buy and sell, I will be able to keep up with the latest technology without spending too much money. Does anybody do this, or have any advice about it? I remember someone saying that they sold and repurchased with every update and basically kept up to date for free.