My only question would be... would you need the tip feature? (I would say no for watercolors, but for sketching or other paintings.. maybe... I don't think this is a bad selection.. just would say consider the need of the features against what you see yourself doing/using it for....
May your world be painted in the Brightest of colors!
-Artist/Illustrator / Film/Media Designer & SFX MakeUp / Storyboard Artist
(All mediums; Conceptual Design, Costume Creation, to Application)