The best replacement for d200 is d80.

The best alternatives to d200 are rated as following:
★★★★★  d80
★★★★  d90
★★★  d300
★★  canon 30d
★★  d2x
★★  30d
★★  40d
★★  d70
★  5d
★  canon 5d
★  d60
★  d40
★  d3100
★  nikon d80
★  nikon d300
  d50
  nikon d90
  d5000
  d100
  20d
  d2h
  canon 40d
  fuji s5 pro
  d40x
  s5 pro
  nikon d300s
  d3000
  s5

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Speaking about d200, one probably shouldn't forget about sigma lens.

Other search terms related to d200 and their ratings are:
★★★★★ sigma lens
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d200
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