I don't really need anything more than 12mp full-frame for my photography as a lot of my work is stitched together
In that situation I would not hesitate buying the D3 or the D700, according to the needed features. I guess their price will come down due to the 5D2, and if Nikon finally comes out with a high pixel count version (allegedly due any day), then the D3/D700 prices will be stumbling, I guess.
However, keep in eyes, that the D3/D700 do not pose high requirement to the lens re resolution, but the edge softness can become a problem with FF. You may need the best lenses (Nikon is better than Canon at the wide end anyway, according to tests).