The best replacement for nikon d80 is d200.

The best alternatives to nikon d80 are rated as following:
★★★★★  d200
★★★★  d60
★★★  canon 40d
★★  d40
★★  canon xti
★  canon 30d
★  canon xsi
★  nikon d200
★  d70
★  nikon d60
★  canon 450d
  canon 400d
  canon rebel xsi
  canon rebel xti
  d40x
  canon eos 450d
  pentax k10d
  nikon d70
  nikon d40
  canon eos 40d
  nikon d300
  canon rebel

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Speaking about nikon d80, one probably shouldn't forget about sb600.

Other search terms related to nikon d80 and their ratings are:
★★★★★ sb600
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nikon d80
d200
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