You have a D100

  • Like what you've got: as long as you don't need the extra pixels or really high ISO values, sticking with it is a reasonable option. But seriously, newer models will outshoot a D100 in all kinds of ways. 
  • Dislike what you've got: Upgrade. The D7000 or D300s is the right answer, I think. You could wimp out and buy a used D200, but the D300s bump up in quality is bigger, and the D7000's image quality is even better, though with some body limitations. A used D300 is another option for the price conscious. A D600 or D800 is a long stretch and would force you to realign your lens selection from DX to FX. Even a D7000 is going to have you trying to figure out shot discipline issues that the 6mp sensor was hiding from you. 
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