I had the D80, then the D90 and for past couple of years the D7000: the upgrade is impressive! Like you, I have the Nikkor 18-200 which works well on the D7000. I do have a 1.8 prime lens to complement the 18-200. I take lots of architectural and landscape, but also animals (Africa, Galapagos -- and backyard birds). The price of the D7000 is low right now. My only complaint, if it is one, is that the camera is heavier than the D90, but then it is much more of a "beast" than that. Having said that, you can still get superb photos with the D90. As they say, it is more the photographer then the camera! (I also have a Panasonic FZ200 24x zoom camera, which I love! See the Cameralabs.com review of it -- along with the FX600). I toyed with going to the full frame, but I'm happy with D7000 and FZ200 and -- being well into retirement age -- decided to spend the money on other things! Good luck in your decision.