So I've got this shiny new macbook. 2.4 Ghz. 4GB RAM. And a 250GB HDD. I purposely brought up the specs as much as I could, because I wanted to "future proof" myself. So how long until programs that come out are over my macbook's capabilities? How long until the norm specs are higher than this one's specs? How long before I start to want a newer, faster model? I tend to go through a laptop a year, but that's because of wear and tear. You think this one will last longer?