I sell my iMac Late 2013 27''. It is very good condition. I just sell since now I'm moving. I bought this on October 2013 with AppleCare, and it is covered until October 2016 (still one year left).
The following is the specification:

3.2GHz Intel Core i5
8GB Memory
NVidia GeForce GT 755M 1024 MB

I'm asking $1,240, which is $200 lower than refurbished one price:
http://www.apple.com/shop/browse/home/specialdeals/mac/imac/27