My wife's 2015 MacBook Air 13 (8/128) has the initial Apple 1-year warranty expiring next week. I can still buy the additional AppleCare for $250 to cover years 2 and 3. OR was thinking I could buy her a new '17 MBA 13 8/128 from Best Buy (on sale for $750) and sell her current one on Craigslist for perhaps $600-$650. On a per-year basis, each would cost me roughly $125 to do (the upgrade to '17 warranty to Feb 2019 and of course the AC covers the '15 til Feb 2020). Leaning towards upgrading to the '17 for her just to get a little extra speed and new machine of course. Which options would you do? Thanks! PS: The 128gb of storage is perfectly fine for her since all of our family media is on a shared Mac Mini and she saves her files to the cloud. I think only 40gb of the 128gb is used.