Any MBP is going to last you for 4 years of college. You could get a BTO penryn/SR, or an off the shelf one. The question becomes, as it always does, how long can I wait until the cost-benefit analysis of keeping my current/getting a new computer becomes more favorable toward getting a new computer. I have a BTO PBG4, and it lasted wonderfully for 4 years of college (well, 8 more weeks 🙂). Nowadays I only use my PB for everyday Apple Mail, Safari, iTunes, Adium, VLC, iCal, etc. I have tried, but it takes too long for video encoding, and other CPU-intensive tasks. So, in 4 years your SR/penryn will be able to do everything that we are doing today, perfectlt, but obviously in 4 years it will not be as good as those computers...