Hi all, I've been browsing the refurbished offerings, and I notice two 2.66ghz 20" iMacs listed at the same price. As far as I can tell, there are two discernable differences between the two: Video card: NVIDIA GeForce 9400M vs. ATI Radeon HD 2600 PRO I don't know much about this. Obviously, the video cards are different. I see there's a big thread in the archives where people discuss the two cards. I believe the gist of what I read in that thread is that the ATI 2600 PRO comes more highly regarded among iMac users. Am I wrong? That said, I'm not a 'power user' and don't play many games, so I'm not sure that I'd even notice the difference. RAM: DDR2 vs. DDR3 I see that the DDR3 memory has the capability of being max'd out at 8gig vs. the DDR2 at 4gig. I assume the DDR2 memory is cheaper, and that the DDR3 is more 'future proof.' Thoughts? I've seen many other slight differences in details between various iMac models recently, as well. Any suggestions/tips? Whatever machine I buy will likely be run/used until it croaks. I'm not a 'power user,' though I may upgrade from Garageband to Logic Express. Otherwise, very basic functions that most Mac users enjoy. Thanks.