Sorry, Rita, I forgot that "
upgraded to Tiger" means that the restore disc that came with your iBook G4 is a Panther disc that doesn't work with Tiger.
Back to your question, though: After considering all that I know about your situation, I'm going to abandon my neutral position and say that unless you
reeeally covet the MacBook Air's sleekness and the 1.5 pounds less that it weighs, the 13" MacBook Pro is the machine you want...faster processor, bigger HD, "
backwards compatibility" in the form of Ethernet and FireWire ports, SuperDrive, and audio line-in, maybe more, same 13" screen, and for the same $1199.
Check it out, and if you've got any questions or reservations, fire away.
Edit: I still intend to check on my MacBook's screen's visibility in bright sunlight, but the sun and I haven't both been "up" at the same time yet.
