I have seriously been considering getting rid of both of my Classic 5.1 Mac Pro's and buying the new 5k iMac when it comes out. I already posted one on Craigslist as well as ebay and I'm not having much luck moving it. The other one is upgraded to infinity and beyond and has been amazing but if I can't sell the cheaper one I doubt I could sell my nicer one and I'm not ready to take a huge loss. Does anyone know a good place to try and sell these? They are both recently rebuilt with new cpus and thermal paste. Upgraded components etc. any help appreciated.