If I had a D700 (which I do) and wanted more camera (not right now), I would get a D800. I came VERY close to getting one.
It's interesting that the D7xxx and the D600 have the same basic controls approach, reminiscent to me, of my D70. The D300(s), D700/800 and D3/D4 all have similar top and back controls, different from the D7xxx and D600. Clearly two different approaches in Nikon-Land. Neither are wrong, but I prefer my cameras to be as similar as possible.
Wouldn't it have made more sense to make the D3/6/7/8xx family the same, and the D5/7xxx family the same?