Sorry, I'm late wading in too! I have had the D90 and have a D7000 (a D800 too). Moving from the D90 to the D7000 was quite a leap, even greater than moving from my D80 to the D300 was. If you do buy a D7000 prepare for quite a steep learning curve as the camera is easily mastered providing the time is invested in learning how to harness its potential.
I would strongly recommend you buy Thom Hogans book on the D7000 and read it cover to cover. Thom's books are the most informative I've read and wish I had bought it. I learned my lesson and bought the one for my D800 Darrell Young's books are a worthwhile investment too.