I had the D80 since it came out and replaced it with the D7000 particularly for the better sensor wrt. ISO noise and the 2000px matrix metering sensor vs the 420px on the D80. Read other reviews on the benefits/or not of going to FX vs DX. You'll be spending a lot more on heavier lenses, albeit, likely better build and IQ benefits. I'll be staying with the D7000 for a long time as it satisfies all my needs now and in the foreseeable future.