I got the 12, could'nt afford the 15, and the 12 is more portable with me being a student/graphic artist and all. I really wasn't gonna get a mac (even though its the industry standard for the feild i wanna get into Graphic Artist), then i started messin around with OS X, and i really liked it.
I'm happy it comes with iLife thats why i upgraded and got the Superdrive

, whats the point of having iDvd and iMovie if you don't have a DVD burner
