Well, I LOVE my D700 but I will be upgrading to the D800
Four years on, the technology has moved on. The EXSPEED 3 processor is way ahead of the D700 as is the focusing system, dual cards, and video. I do not really want more pixels but some of the images posted have been to use an American word, awesome!!
I don't shoot too much in dark coal cellars so while the ultimate ISO may not be as good, I feel from what I have seen is good enough for me. I love portrait and event / wedding photography and here I think that the D800 will reign supreme.
Anyway, you can't beat a new toy when you suffer from NAS!!!