The best replacement for nikon d3000 is d5000.

The best alternatives to nikon d3000 are rated as following:
★★★★★  d5000
★★★★  canon rebel xs
★★★  canon rebel
★★★  canon 1000d
★★★  canon xs
★★★  canon t3
★★★  d60
★★  nikon d5000
★★  d40
★★  canon xsi
★  nikon d60
★  canon t1i
★  canon eos rebel xs
★  canon 450d
  canon rebel xsi
  canon rebel t2i
  canon rebel eos xs
  canon rebel t1i
  pentax kx
  canon eos rebel xsi
  nikon d40
  canon eos rebel t3
  canon eos
  pentax k-x
  canon t3 slr
  d50
  rebel xs
  sony a230
  sony a330

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Speaking about nikon d3000, one probably shouldn't forget about external flash.

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