I need some advice. Currenly have a D90 and was thinking of upgrading when the D7000 or D300 replacement comes. But the D600 made me think about it. However, I have many DX lenses. Quick question: if I take a picture with the D600 on DX crop mode, how that would compare in quality with taking the same picture with the D90 or with the D7000? I suspect that with a 10.5MP crop mode compared to 12MP of the D90, it should be very close or better.