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Re:New Entry Level 21.5-inch iMac by judk on Wednesday June 18, 2014 @01:06PM (#7911215)
Only if you like to upgrade frequently. Otherwise your prev gen refurbished will run into non-support for the next OS or hardware innovation.
Re:New Entry Level 21.5-inch iMac by joezydeco on Wednesday June 18, 2014 @01:26PM (#7911340)
Perhaps for iOS devices, but the desktop stuff can run for a long time on older hardware.

I'm personally using a refurbed Early 2008 iMac that runs Mavericks just fine. It needed more RAM and hard drive space, but that was nothing that I couldn't have purchased when I bought the machine.