I was wondering if the 1GB of RAM (standard) is enough for the machine for smooth use. I would think 2GB would be good, but for 2GB default for the iMac, you have to buy the most expensive one. This makes me think that 2GB is really unnecessary, otherwise Apple would have made it default for the 2nd iMac option, like the MacBook. What are your thoughts? Is 1GB enough, and if not, why didn't Apple push it on a lower iMac?