I have received my new iMac from eBay just recently.
It isn’t the latest release by Apple… it is an early 2008 spec iMac, 20″ and I have upgraded it to the maximum 4GB ram memory (although it unofficially supports 6GB) and I might get one in time to come.
I have dual-booted it with the original Mac OS X Snow Leopard, and also partitioned it and put on and upgraded my OS X Mountain Lion that I purchased from the Mac Apple Store.
I love it! It runs like a dream, and I haven’t once heard the fan kick in on it, and I have done pretty intensive graphic games and apps I use – do it was well worth the £450 I paid on eBay for it… one if my much wiser moves!