In evaluating the I'm concerned about the video chip. I know in the 15" PB the chip is much better, but what about in the 12"?? It's listed as: iBook: ATI Mobility Radeon 9200 32MB DDR video memory 12" PowerBook NVIDIA GeForce FX Go5200 (64MB DDR) What's the story on the difference between these? Obviously you have the extra 32MB, but what does that mean in real terms? And what about the ATI vs. the NVIDIA? Thanks for any help on this!!