I'm not sure the difference in IQ between a D7000 and a D700 is really that much, in fact given that choice and knowing the output of the D7000 I would choose the D7000 for IQ reasons. I shoot mostly at low to moderate ISO and need a high DR and a decent pixel density. The lenses will make a bigger difference here, a good lens on the D7000 will give better IQ for most people than a poor lens on a D700. However, some lenses like the Nikon 14-24mm f/2.8 just have no equivalent on a crop camera so for landscape work you end up torn between a D700 with a 14-24mm and a D7k with a Nikon 10/12-24mm which is not as wide or sharp.
The difference between a FF and crop camera is about 1 stop of light gathering area, so equal to about 1-2 generation of sensor development. Hence The Nikon D7000 is roughly as good as a D700 or even the Canon 5DMKII and the mark III only better at high ISO noise performance, with a much worse DR.
http://www.kenrockwell.com/tech/full-frame-advantage.htm
I know it's uncle Ken but I've seen the same sort of results in my shooting. I did a couple of tests with my dad's ancient and awful Sigma 70-210 on my 5D wide open vs a new Tamron 70-300 stopped down to f/8 on my dad's d5000 and the 5D + awful lens walked all over the d5000 for sharpness. Don't have those images on this laptop, mind.
Sure, the d7000 has some pretty phenomenal dynamic range, but I don't really need that much DR and I don't think that many people do, at least not in favour of the depth of field, noise and sharpness/cropability of full frame.
Also, the high ISO noise performance is nowhere near equivalent to the 5D2, let alone d700.
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