I just received my D800 and had a play with it yesterday. I too have a D7000, and a D3s so I have a combination of DX and FX lenses so I bit the bullet and purchased the D800. First impressions, ... the D7000 will be sold along with the lenses and accessories. I am blown away by the quality of the D800.
This makes the choice easy for me as I am not worried about the file size appart from the extra costs for the larger cards. I can now standardise on my lenses and move on.