Hello, I would like your opinion on this matter: I am planning to purchase a PB. I can not decide which PB to purchase. I will be using the PB for PowerPoint, Presentation, and Graphic. Should I purchase the 17 inch G4 1.0 or 15 inch G4 1.25? What is the different between G4 1.0 L3 cache and G4 1.25 L2 cache? Please help. Thank you, all.