I have a Dual 1 GHz Quicksilver G4 currently with 1 GB SDRAM. I have run a little program in my menu bar that diplays processor usage, and I've noticed that over the past year or so, it seems like my computer takes like 85% usage for what usually use to only require like 10%. My HD has about of space and I've been running the same type of apps. I don't really run "big" apps, but I run lots of apps all at the same time. Do you guys think another 512 for a total of 1.5 GB is justifiable? Or just a waste of money?