I see, as usual, the iMacs come with strange RAM configs for upgrading, 2x512. I need 2GB, preferably 2.5GB, but thats an impossibility within cost constraints, as 2GB chips are quite a pretty penny. So 2GB is a good place to stay. Meaning, Id need 2x1GB. But, with the stock being 2x512, is it better to pay $175 for the Apple RAM upgrade to 2x1GB or Keep the 2x512, buy 2x1GB for about $225 and sell the 2x512 for at least $50!? Anyone want to buy this 2x512?