I just traded my D90 in for a D7000 yesterday. I went to a local camera store here in Houston rather than the "big yellow price tag store". (the "camera guy" at the BB tried to convince me that a d3100 was a better camera than the d700 a few weeks ago, at that point I went looking for a real camera store)
they are (d90 and d7k) are very similar in their layouts. a few minor diffs, but other then that the 7k is a little bigger they are pretty much the same. The d7000 does have two sd card slots which I love (raws on one, jpegs on the other or you can configure it a couple other ways).
You can push the ISO to 25k. I've just been playing around here at the house and gotten some very good results at ISO 6400 with little noise.
Of course I just went to the camera store to buy a ND filter and came out with a new camera body.....most expensive filter I ever bought. (Then I had to turn around and go back as i forgot the filter)