The short of it is, is the D7000 as good as the D700 in low light? The reason I ask is the long of it below. You can just answer the top question if you like.
Now, I have a D700 and I am very happy with it. But I now want a camera with the Video option. D800, nice, but not only is it expensive but for my purposes I will need to spend around £400 on a spare battery, a couple of bigger CF cards and a larger portable drive. Two weeks in India with that baby and 500gb won't cover it. Stepping back to crop sensor, right or wrong, doesn't feel right to me. Also, the D700 performs really, I mean REALLY well in low light and I have read that this is mainly attributable to the sensor size. I do like my low light and will be shooting a lot of it. So, sell my D700 & FX 28-300, buy a D7000, DX 18-300, some big SD cards and a battery? This option will cover itself financially. Or, sell D700, keep FX 28-300 and blow 2 grand on D800 and supplementary accoutrement?