So I may be getting a Powerbook. I was looking at a 15, but it's gotta go to class with me and the 15s don't look very portable. I have a 12 inch iBook right now and I can see the screen fine without my glasses, so visibility isn't really an issue. Plus the 12 inch PB would fit better into my budget. Is a 15 really worth it? The way I'm seeing it, I lose 3 inches of screen real estate and pick up a superdrive and still spend $300 less than my original plans. Thanks