Right now I'm at 256mb with my pbook and I want to upgrade RAM. The price difference between the two is $70 for the 512 vs $230 for the 1 gig. Combining price and performance into the equation, which is a better upgrade path for me? I wouldn't mind saving some money but if the difference between 1.25gigs vs 768 is worth it, then I'd do it. So what do you guys think or did yourselves? I don't do anything graphic intensive, just the typical web browsing with multiple windows, Adium, iTunes, some Word documents etc.