I'm looking through the listing here on amazon for used imacs. http://www.amazon.com/gp/offer-listing/B004YLCE2S/ref=dp_olp_used?ie=UTF8&condition=used The pricing is varied. I imagine that the ~$800 ones have something wrong or aren't worth buying. But maybe I'm missing something? Has anyone had experience buying an iMac this way? How did it go?