I have a 15" C2D Macbook Pro. It has the intel T7600 (2.33 Ghz C2D processor with 4 MB of L2 cache), 4 GB of RAM, and the ATI x1600 graphics. I'm giving some thought to one of the new 13" MBP's, since now that they have added firewire again on the 13" size, I can actually use it for my purposes. My question for the class, is how does the ATI X1600 compare with the Nvidia 9400M for 3D graphics performance? X1600 was a mid-range performer in its time, and the 9400M is in the low-end by today's standards. I have a feeling they're not too far apart performance wise, but I don't want to take a step backwards. Anyone know of any benchmarks comparing the X1600 to 9400M in real-world tasks?? Also keeping in mind the difference in screen resolution between the two. TIA!