I've got the opportunity to get a pre-owned 20" 2007 iMac with stock specs,1 GB of RAM. I know if I can upgrade the RAM to 4 GB (I've herd you can put even more in) that I can get to 10.8. Is it worth it? The seller says she's got a thin red line down the display, but I've got a friend who works on Macs that may be able to hook me up. I'm not thinking about doing anything TOO intensive, possibly running BootCamp and maybe some light gaming.