I ordered the 256GB MBA and upgraded to 16GB RAM. Since my order is still processing, I have the option to cancel it. Originally I felt that 256 GB was enough but now I am worried that it may not be enough a few years from now. I will be using it for things like programming, web developement and photo editing. If I switch to 512 GB, I would upgrade to the 8-core GPU model and upgrade the ram of that to 16GB. Anyone have a 256 GB MacBook and feel comfortable?