Thinking about getting a new FF Nikon body. I see that the recertified D800 is around $500 cheaper than a new one but only 90 days warranty vs 1 year. Then there is the D600 at $900 less than a new D800. Anyone has any experience with Nikon recertified D800? Besides the warranty, I just don't see any advantage over the new D800. Or should I just go with the D600. Ken Rockwell seems to think really highly of the D600.