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I would say if you're going for a pro then go for the 15" MBP, you get the full resolution display which is great for design and feels much more comfortable. I'm using one now. Especially the trackpad and screen size.

On the 13" i'd go with an Air because where it loses in some places it makes up in the advantages, such as weight and portability.

These are the choices i'd look at when looking for another Mac. My recommendation for an all rounder is the 15" pro. It's not too heavy, thick or hard to work from. I know a few 17" owners and they have trouble opening it up and using it in a lot of places.