re: iMac- is this a good buy?

I bought that same model in 2009, but with the ATi card.

It was a great computer until I ran into the issue the previous poster posted.

I would ask the guy if he ran into that issue. You can boot the machine and it'll look fine until you start to use it, then that's when it would start to freeze.

If you do buy it, the first thing I would do is open everything on it, and let it run for a good 2 hours to make sure you don't have the issue.