I'm running 10.3.9 on a dual 1gig G4 MDD with 1gig of RAM. I use the machine primarily for graphic design, so it's got CS 2 and Suitcase, etc. It's been great and runs like a dream, so I haven't really had a need to upgrade the OS. I got an iPhone yesterday, though, and I need to be able to sync it. So my question is should I jump straight to 10.5 or would my machine run better with 10.4?