So, I see that there's a couple refurbished Macbooks on apple's site, and they've piqued my interest. I'm a junior in college, using last revisions 13" MBP (got it after my freshman year), and it's been a great machine. My younger brother is about to enter college for 4 years, and is not as tech savvy and probably doesn't need the "pro", and will happily settle for just a MacBook. Would it be unwise to get a refurbished MB for him? Also, the two on apple's site are last year's and this year's model, with the only significant difference being that one is 2.26Ghz and one 2.4Ghz... is that processor speed difference going to be significant throughout his next 4 years?