Curt is absolutely right, the D7000 is the clear choice --- unless you were a longtime Nikon film-camera user. When I first saw the D7000, I was disappointed. It was exactly the camera I was expecting Nikon to introduce at Photokina, except --- it was DX format. If you look closely, you may see that the few things folks complain about on the D700 were mostly addressed on the D7000. Extra memory card, easier way to access your saved Picture Controls, more MPs, newer Expeed processor. It is exactly the camera folks have been expecting as the upgrade on the D700, except for the format.
If you are OK with DX, the D7000 is probably the best treat you can ever give yourself. If you want to use your old AF20mm, AF24mm, AF28-200mm, etc, then the D700 is a dream come true.