The Macbook Pro is the only Mac notebook that has a 17" screen. Although the Macbook is a nice little notebook, at 13.3" it would be hard to get all your art work done on there without having to resort to screen spanning.

Size matters when you're in Photoshop or something similar. You need a lot of screen real estate, besides all 17" notebooks have high resolutions, so that's a non-issue.

I would look into some 15.4" notebooks, though. That might be good enough.