re: iMac- is this a good buy?

I would check to see if it's an early 2009 model. There's a defect in the video card that causes overheating. Only reason I know this is a client recently bought one off of eBay and the display would go nuts and the machine would freeze. I thought it was just defective, so I ordered one through my wholesaler. It did the same thing. Researched it and it seems to be pretty common with that model.

I can't find the apple forum discussion that I saw originally but found this one that describes what happened to us. LINK

It was a great price point but they ended up just buying a new one from the apple store. Just a heads up. At least make sure there's a return policy on the eBay item.