I am amazed at all the thoughtful comments that have been posted on this thread. I, and I know others on the fence really appreciate all the time folks are taking to share their experiences. Since I started this thread, I thought I would add a bit more info. I already have an 18-105 kit lens and the 70-300VR Nikon, Nikon AF Micro 105 F2.8D, Nikon 35mm F1.8 prime, and Tokina 11-16.
I typically use the 18-105 for 80 percent of my everyday shooting. I love the big range especially at the lower end. It goes well with my Tokina for wide angle. However, I know it is not as sharp as ome of the mid range zooms offerend by Nikon, and sounds like some of the other manufacturers.
I do have a possibility of passing on my D90 to someone, but it would require giving up the 18-105 lens as well. That would leave a delemma. Get another 18-105 as the kit lens with the D7000 or try a third party mid-prime lens with the D7000 body. I can't afford a D7000 and a Nikon pro lens. The other option, which was mentioned and is actually a very good one is to get a faster pro nikon mid-range zoom and keep the D90. That still only gives me, and I am an old 35mm photographer going back to the Nikkormat FTN, only one stop faster than the 18-105, but a sharper lens. It is really a tough decision.
I am not sure if this additional information is helpful to the discussion but thought I would throw it out there anyway.