With all my work files being available on dropbox, I'm still deciding whether I should go with the 256 or the 512GB Storage option. At this point, I'm not really sure how much of a difference can I expect from the 1.1 and 1.2Ghz processor. What are your thoughts? 256 or 512? Is it worth spending the extra $$ on getting the 512 and 1.2Ghz if I plan to keep this laptop for atleast 2 years.