Hello there, I bought a 12inch Powerbook G4 a few months ago to use for web design. It was my first Mac having worked for years on a PC. On the whole it works well. I love its portability, quiet fan and the Panther OS. However, I find it slow at a lot of things, particularly the latest versions of Dreamweaver and Fireworks and I generally need to run Virtual PC 6 to test my work in Windows browsers. This is achingly slow. I've been thinking about upgrading to the 15in or 17inch models, what would anyone recommend? Will there be a really signficant performance difference? How would they rate against a Pentium 4 PC?