well, the choices you need to consider, pro has a stand alone graphics card, it’s a bit more sturdy, features the new touch interfaces, and has a larger sreen.
on the other hand, the regular MB is a pretty powerfull machine, with the 2nd model aleady having 2gb of internal memory, and they’re a little more afordable
what kind of design do you want to do? 3d modeling? page layouts? photoshop stuff?
(these questions are great to brush up on my sale skills, thanks)