So I recently had some issues with my baseline model mid2010 Macbook Pro and am faced with needing to upgrade most of the components and battery within the MBP. Now I'm considering switching to a used MacBook Air. I have seen some on ebay that look like they would be in my price range. I have a lot of big expenses coming up soon so I can't really justify purchasing a brand new MBA...but for a few $100 more would I be better to get a used 2013/2014 MBA or switch out the parts in my mid2010 MBP? I've been keeping an eye on ebay. Does anyone have any suggestions of other places to look for people selling used MBAs? I've considered the refurb route but so far ebay still seems to be my better bet. Lastly, if there is a new 12" MBA released around Oct with retina. Has anyone seen if that causes an influx of the product on sites such as ebay and if they usually sell for less than they would be selling for now? Thanks!