I'm interested in a PS3. I have some PS2 games but no PS2 anymore, so I was thinking that backwards compatability might be worth getting a used one on ebay versus the new ones that can't play PS2. It's eBay, so the prices are scattered, but 60gb systems seem to go for $280 - 350. Do the old ps3's have any issues that would make a used system not worth the savings? Were there any important HW/SW changes that are only in the new systems?