i have never owned a Mac. I am looking to get an iBook G4 from Craig's List. It is 512MB RAM and 40GB hard drive. Sounds horrible, I know. Runs Tiger 10.4. I want to browse the web, use iTunes to sync my iPhone 3G, and mess around with Garage Band to record some tracks with my guitar. Is this sufficient? I do have 150GB external drive, but I don't want to carry it every where, and can't because it needs to be plugged into a wall outlet. I know PPC sucks and isn't Snow Leopard compatible, 512MB is ridiculous, and 40GB is small, but is it good for a first mac?