I was saving my money for a 5Diii, when the 6D was announced I considered it, but just yesterday I bought a barley used 5dii for 1,400.
I'm sure the 6D's wi-fi and GPS are nice, I just don't see myself actually using it. The 5diii is very expensive, but is worth every penny, as much as I would like the better AF system it's just not worth the extra price for a casual shooter such as myself. Also seeing that the 5diii sensor is only a small improvement over the 5dii, this pushed me into the 5dii purchase.
Even though value is a subjective term, I think the 6D, 5dii, and 5dii are all decent values. If you can find a lightly used 5dii for a reasonable price I would go for that, put the money you save into glass.