Normally I would recommend a TiBook. However, the 500mhz model is the very first Ti Powerbook. It does not have a Quartz Extreme enabled video card, and only has 8mb of VRAM. This means that overall, OSX will be chuggy with its visual effects. This MIGHT not concern you, but the iBook does have a Radeon 7500 with 32mb of VRAM which would provide a much smoother experience, even though its not as sexy as the TiBook.