Thanks for the great advice. I'm thinking of going with the d90 instead of the d7000. I really need the better iso for indoor shots. I'm thinking I'd be able to use 1.8-4 with the better iso on the d90 compared to the d40. If my thinking is right that will keep me from having to go to 1.4, etc. I just hope the iso improvement from the d40 to the d90 is such an improvement that I don't need to go to the d7000.
I see that the sensor in the D7000 is newer and bigger then the d90. I will almost NEVER (if ever) use the camera to take videos. Is the newer and bigger sensor only for videos or will increase my picture quality as well?
I'm not sure if the sensor from the D40 to the D90 is as big of a jump as the one from the D90 to the D7000.