In the realm of technology, the newer are always the higher tech and the better. As Ken reviewed and shared, noise handling, sharpness and overall value, the Nikon D90 blew the Nikon D200 and Nikon D300 out of the water!
So, just in case, you want to prematurely move onto the Nikon D300 (like me a while back), hold your horses and think again. Maybe, the Nikon D400 will save the day?
Check out the few review [here]. Yes! Its a satisfying meal for me.