The best replacement for d2x is d300.

The best alternatives to d2x are rated as following:
★★★★★  d300
★★★★  d2xs
★★★★  d200
★★  d700
★  canon 5d
★  d2h
★  nikon d300
★  5d
  1ds
  stx
  1d
  fuji s3
  nikon d200
  canon 1ds
  d3x
  canon 1d mk2
  canon 1d mark ii
  d2hs
  1d mark ii

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Speaking about d2x, one probably shouldn't forget about sb 900.

Other search terms related to d2x and their ratings are:
★★★★★ sb 900
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d2x
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