At the time I got my iMac (1.25, Superdrive, 17", 80GB, 256MB RAM)it was the top of the line before the 20" came out. I am going overseas to work in Bosnia and it will be my main source of entertainment for the next year. I can run xplane and other such programs but how much of a difference will it make adding memory. Will 512 give me a significant performance boost? Or should is it remotely worthwhile ($$$ wise) going much higher to 1GB? I want to get a G5 but I would rather wait till I get back to the US before I get it. Any advice would be great!!!