I've never posted to one of these, so bear with me. I am entering into my second and final year of graduate school in graphic design. I will be taking many classes, teaching, and doing lots of freelance work on the side. I currently have a PowerBook G4 1.67 GHz with 1 GB Memory. I have decided that even though my PB still works, i need to take the plunge and get something that works harder, as I am often running 3-4 Adobe programs (Illustrator, Photoshop, InDesign, Dreamweaver, or Flash) and my PB slows me down considerably. This doesn't cut it when I've got school work to do and clients waiting on projects. So my dilemma is: Do I get the 13" macbook pro 2.53 ghz or 15" 2.66 ghz? I can't afford the 2.8 ghz, so that's out. I'd love to save the $300 with the 13" but am wondering if I'm being dumb and should shell it all out for the more advanced system? Regardless of which I get, I will be purchasing an external monitor, so screen size isn't too worrisome. Granted, I will only have the laptop when at school, but when doing hard core work, I'll be at home with my monitor. Bottom line: The main difference between the two (other than the graphics card which, as far as I can tell, I don't really need for my work) is the GHz. Is it worth $300?