I do all of my painting on a 20" iMac, but I think I want to change over to a smaller but more portable 15-17" Macbook. I guess my question is, will I really miss the couple inches I lose on the screen, and is it better to have a solid home base like that. Or do a lot of you guys use portable computers as well, I want to know what would be the more professional choice. I just figured it works better with my lifestyle since I can't always be at home. To me I can't really see a major difference, but decided to ask since it is an expensive decision.