My iMac is getting a bit long in the tooth, and I was hoping to upgrade this autumn after Yosemite comes out. I didn't know how much, if anything, it'd be worth being 5 years old... I was just going to give it to my dad... but looking on eBay I'm seeing really respectable prices for models lesser equipped than mine. Can I really expect $600-800 for my iMac? 27", Late 2009 - No damage or scratches beyond ordinary wear. 2.66 GHz i5 12GB 1067 MHz DDR3 ATI Radeon HD 4850 512MB 2TB internal SATA Edited to add: Also, do you think now is a good time to sell? Will the price drop precipitously after Yosemite and the autumn iMacs are announced?