I've recently started working on illustrator files and am having some issues with its performance. The files are multi-layered, with about 40-50 layers, totalling about 20-40mb in size. I'm using my powerbook (1.5ghz, 1GB ram, 128vram), and performance is, well, slow. Performance on an XP machine (P4, 1GB ram) is also slow and it often crashes. I need to upgrade the PC to ensure that performance is acceptable (can't do much about the powerbook), and will be looking to get a G5 as well. What is the most important component to ensure smooth performance/quick refreshing of the display/smooth scrolling? I think it is probably the video card - what is the best graphics card for this application?