Good deal at Apple for a 2017 model. It is refurb, but carries a new computer warranty.
Add tax to order.
I was asked to post this, may not be available for long. Good deal compared to 2015 deal that is gone.
Refurbished 27-inch iMac 3.4GHz quad-core Intel Core i5 with Retina 5K display
Originally released June 2017
27-inch (diagonal) Retina 5K display; 5120-by-2880 resolution with support for one billion colors
8GB of 2400MHz DDR4 memory
1TB Fusion Drive
FaceTime HD camera
Radeon Pro 570
The 2015 does have the bigger, faster hard drive going for it.
Yet, it falls behind the 2017 imac in the following
2017 cpu 7th gen processor up to 200mhz better with turbo boost
2015 has the 6th gen processor
2017 has 4 GB Radeon Pro 570 to push the 5K pixels
2015 has 2 GB M395X with only 2 GB, not enough to push 5K pixels properly
2017 brighter, more contract display, smoother motion
2015 jitters and stutters especially trying to push 5K with only 2 GB of video
2017 DDR4 2400MHz memory
2015 DDR4 1866 MHz memory
2017 Faster SSD speeds
2015 Slower SSD speeds
2017 imac was 75 percent faster in Final Cut X
2017 imac was 45-80 percent faster with real world editing in Final Cut
The 2017 imac has bluetooth 4.2, runs quieter, TB3. Not found on the 2015 imac.