Kent asked the best question. Why are you upgrading?
If you want better focus tracking, bigger viewfinder, bigger rear monitor, live view, higher output resolution, better output quality, higher ISO range, AF fine tuning, metering with non-CPU lenses and dual card slots, or you've got just some spare cash and want to spend it on a new body, go for the D7000. If you want to bracket more than three shots at a time, you need a D300/D700/D3/D4. If you want a full-frame sensor and/or the biggest viewfinder, you need a D700/D3/D4. If you want a built-in vertical grip, you need a D3/D4. If you want the fastest burst shooting speed, you need a D3. And so on...
However, if your profile is anything to go by, you might consider some f/2.8 glass before you upgrade your body. I see a noticeable improvement in sharpness and contrast between my 18-70 and 70-300, so I can only imagine how much better things could be with a 17-55 to replace the 18-70 and a 70-200 to replace the 70-300.
The biggest upgrade I ever made was to good glass. Going from the kit lenses to my 70-200 and 17-55 improved the visible quality of my images immediately. Even more when I really learned how to use them.
Later, I upgraded to a D300 because of the bracketing, mirror up capability, etc., etc. I use my D300 and D70 together for weddings and other than by the image size, you can't tell the images apart if you keep the iso down to noiseless levels.