... is 8 GB of RAM enough to run a laptop for 4-5 years? Or will the RAM be the first thing 'to fail' (in terms of obsolesce) on an 8 GB machine? Most of my work is PDF, Word, etc. Very occasional heavier work (i.e. molecular modeling) but I could always do it on a different machine. I'd think even the 12" Macbook would be okay, but I'd appreciate more ports and a little more screen real estate. I picked up the 15" MBP and love it... but I'm wondering if I wouldn't love the 13" just as much as save a little cash (plus portability). Thoughts?