I recently switched from a 13" MacBook Pro to a 27" iMac. I love the iMac, but work that I'll have in the future will require me to have a mobile Mac again, in addition to the iMac. I'm debating between the base MacBook Air and last year's base 13" MacBook Pro. Both are roughly the same price as refurbs, but I'm debating which would be better. I'd be using it exclusively for web design, Photoshop, and possibly some work with Xcode.