Which MacBook Pro screen size would you choose for the following? - Viewing 6 or more hours daily, not hooked up to external display. - Will be my main computer. - Used for work and entertainment, heavy emailing, use of iWorks software, light photo and video editing, surfing, no gaming. - Will go with me nearly everywhere, home, office, cottage, travel. Used on desk, heavily on couch, deck, kitchen, bed, cafe. - Price not a factor. 13, 15, or 17" screen, please vote in the Poll. Thanks.