The best replacement for d50 is d70.

The best alternatives to d50 are rated as following:
★★★★★  d70
★★★★  d40
★★★  d80
★★  d90
★★  d65
★★  d60
★  canon rebel xt
★  d70s
★  350d
★  rebel xt
★  d200
★  jd 800
★  d100
★  nikon d70
  d5w
  canon 350d
  nikon d40
  d40x
  glucagon
  nikon d3000
  canon rebel

Your alternative for d50 is not listed? Suggest!
Speaking about d50, one probably shouldn't forget about sb 800.

Other search terms related to d50 and their ratings are:
★★★★★ sb 800
★ sb400
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d50
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