I agree with all that has been said already. I own a D90, by choice after much research, and I couldn't be happier except for one thing; I would love the higher megapixel sensor of the D7000/D7100 in some cases.
I could not get by without the ability to use the older AF lenses so my choices would, and will always be, between the D90, D7000 or D7100 bodies.
Since I don't need video and the ability to print above smallposter size images, the D90 is absolutely perfect for me and I love its body size. It feels like a large camera which is what I wanted.
Look through the dedicated camera body forums here and see some of the images produced by each camera and see if that helps you out. Tell us more about what exact type of photography you are most interested in as well and that will help us to help you.