11-18-2017, 05:52 PM
I can tell you from recent shopping that about the cheapest you can get a USED 2013 21.5" 2.7/8GB/1TB hard drive iMac is about $450.
The nice thing about the 2013's is that they all came with the PCIe slot, even if it wasn't configured that way (2012's did not), so you can upgrade later (albeit, it's a giant PITA to do it and the drives are expensive on their own), but you can also swap the 2.5" hard drive for a 2.5" SSD (slightly less of a PITA). But both options require cutting and replacing the adhesive for the LCD, so budget $20-50 for tools and adhesive. I'm about to embark on this adventure for a 2013 I recently got (any weekend now...).
The nice thing about the 2013's is that they all came with the PCIe slot, even if it wasn't configured that way (2012's did not), so you can upgrade later (albeit, it's a giant PITA to do it and the drives are expensive on their own), but you can also swap the 2.5" hard drive for a 2.5" SSD (slightly less of a PITA). But both options require cutting and replacing the adhesive for the LCD, so budget $20-50 for tools and adhesive. I'm about to embark on this adventure for a 2013 I recently got (any weekend now...).