A D700 in that price range would, no doubt, be fairly well used. I do believe that unless you NEED video or HUGE prints, the D700 brand new for $2200 ain't a bad way to go right now. Because of the vast differences between the two bodies and the fact that even Nikon says the D800 is not a replacement for the D700, I think many people will keep their 700's and many will continue to buy them. If people shooting a 700 need a new body, they will have a decision to make. If they don't need a new body, I think a significant amount will wait. IMO the D4 makes more sense as a replacement for the D700 except of course for the huge price difference. Personally, if my 700 disappeared tonight I would buy another one tomorrow. If I were to add another body in the short term, it would be a D3s unless I win the lottery or Nikon gives us a D700s. I love my 700 and the 800 doesn't improve on the things that I love about the 700 enough for me to switch at all. But then again, that's just me. I don't think either body would be a mistake if you're wanting an FX camera, however. Good luck!