Looking for a non-retina Macbook Air 13". I have these two choices, mainly looking for good video editing on the go. Choices are: Refurb Mid 2012 i7 2.0Ghz, 8GB, SSD 256GB, Intel HD Graphics 4000 $1,079 from Apple or New i5 1.4Ghz, 4GB, SSD 128GB, Intel HD Graphics 5000 $800 with student discount at BestBuy (MD760LL/B) Essentially, is a newer i5 1.4Ghz better than an older i7 2.0Ghz? Or is the i7 worth $280? Thanks for the help.