The best replacement for nikon d70 is d50.

The best alternatives to nikon d70 are rated as following:
★★★★★  d50
★★★★  d100
★★★  canon 20d
★  d60
★  canon rebel xt
★  nikon d80
★  canon 350d
  nikon d100
  nikon d70s
  canon digital rebel
  nikon d50
  canon 10d
  canon rebel
  canon 400d
  canon d20
  canon xt

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Speaking about nikon d70, one probably shouldn't forget about manual lens.

Other search terms related to nikon d70 and their ratings are:
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nikon d70
d50
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