How into photography do you want to get? The d7000 is a great camera, but it will take a bit of commitment and learning to get the full benefit from it. If you are happy to keep it in auto or scene mode, you might be better off with something lower in price.
Models like d3100, d3200, d5100, d5200 are more menu driven. To change many of the settings on these you need to get into the menus. On the d7000, you have direct access to many functions so you can quickly change settings as you shoot. This does you no good though if you forget what the buttons do. So if you will use your camera often and get 100% comfortable with it, the d7000 is a great camera. If it will sit around for weeks at a time and come out for special occasions, then I think the more menu driven cameras are easier to find your way around.
The d7000 has a top lcd display that is very nice to instantly see what your most important settings are. Also front and rear command wheels which is nice for quicker shutter/aperture changes as well as other settings. It also has a focus motor which lets you use certain older lenses that the other cameras I mentioned can not easily use.
So think about where you want to go with this and what you want from your upgrade. Try to look at a d7000 and a d3x00 or d5x00 in person and see how they feel. Download the manuals. Both styles are very good cameras, but with different user interfaces.