I'm looking to buy either a refurbished Mac Book Pro or a refurb Mac Book air. I know that while Apple prefers that you not replace the original SSD in a MacBook Air it is possible ( see http://eshop.macsales.com/shop/SSD/OWC/Air-Retina ) . My intent is to put a larger capacity SSD inside. I'll use an external Thunderbolt drive for actual image storage. The MB Pro or Air will supplement my desktop system for when I am traveling or for writing when I don't want to/ can't sit at my desk.