You have some glass which will work great with the D800 or D700 but I have found that all my lenses just perform better then ever before. Even the low cost Dx lenses of which I only have two.
For most studio shots you would not notice the difference between the D700 and D800 but in more challenging conditions of light sources you will notice that the D800 is probably the best camera so far for the basics like metering AF tracking, color and DR. The subsystems have a very polished feel to them. It is very rare in mixed source light temps to have the AWB miss.
All this means, even if one really does not need the res of 36mpx or the noise advantage of downsizing, the harmonious cooperation between the subsystems will result in fewer shots taken, less "safeties", less post processing but if you want to do something more radical, the D800 files are the most flexible you could hope for. The shadow noise at low ISO can be pushed a lot before noise and color start to be a problem.
I find that I use LESS storage space than the D7000 because my shot count has gone way down while the keeper rate and total number of keepers has gone up. High quality 14 bit lossless compressed RAW files are about 40mb.
If you have an interest in trying one, you probably know someone who can let you use theirs or rent a D800 for a day or two. I am confident that you will be impressed
Stan
St Petersburg Russia

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