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My conclusion regarding the extra megapixels and low light was to use fast lenses when deciding what type of lens to use. I know they cost more but fast F ratio lenses generally speaking have nice characteristics that you would want anyway. Also for widefield astro work fast f ratio lenses become pretty important regardless of the camera used.
With regards the 800E my main concern now would be how it performs in video, if moire is an issue in video. One post on DP review indicated it would not as the image is so heavily downsampled to arrive at 1080p. Another post conflicted this so I don't know what to believe. So I am going for the D800 as sharpening and tonal contrast will arrive at much the same sharpness and lens choice, accuracy of focus are possibly more important as factors in the final sharpness of the image. Mind you, your images are mostly landscape? In which case you have nothing to lose.
Greg.
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