The best replacement for d3000 is d3100.

The best alternatives to d3000 are rated as following:
★★★★★  d3100
★★★★★  d5000
★★★  d60
★★★  canon 1000d
★★★  nikon d5000
★★  d90
★★  d40
★  nikon d3100
★  d80
★  canon rebel xs
★  nikon d60
★  rebel xs
★  t1i
★  xsi
★  canon t1i
★  canon xs
★  d70
★  t3
★  canon 450d
★  canon rebel
  d200
  k-x
  canon t3
  1000d
  canon eos rebel t3
  rebel t1i
  d40x
  kx
  450d
  canon eos rebel xsi
  eos rebel xs
  1100d
  canon t3 slr
  sony a230
  xs
  canon xsi
  nikon d40
  sony a330
  rebel t3
  canon d450
  canon eos 1000d

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Speaking about d3000, one probably shouldn't forget about lense.

Other search terms related to d3000 and their ratings are:
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