I have had a distaste for windows for a while, and with OS X including UNIX, i could finally justify spending the money on a new apple machine. Windows has gotten so bloated and full of useless crap, that i wanted a system that could run (and develop software) without having to install 5 - 7 gigs of software. The free developer tools with OS X also were a nice draw, as visual studio .net is like $200 to students, and $700+ after college.