I know this hass probably been discussed, but I just about have my mouse on the "buy" button for extra RAM for my Powerbook, and I want to be sure I'm spending my money wisely. I know many people recommend going from 512MB to 1.25GB. However, I typically use only Word, TextEdit, Mail, iCal, RSS, Camino, and iTunes. Often times, all of these are open, but none of them are huge resource consumers. So, will I ever really use the 1.25GB or will I be spending an extra $70-80 on unused memory, when 768MB would be plenty?