hey guys, i just bought my apple ibook in january and made the switch. (THANK GOD, im N-E-V-E-R going back to windows)...i was kinda skeptical when i bought my ibook, cuz i didnt kno much about apple. so i bought the cheapest ibook ( 1.2 ghz, 256 ram, 30gb) but im thinking about now getting a power book. problem is that its kinda expensive, so i thought as an alternative just buying more ram. in your opinion, buying 512 ram to have a total of 768, will i SIGNIFICANTLY notice a change?? as in faster?? thnx guys...