The best replacement for nikon d5100 is canon t3i.

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★  nikon d5200
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★  canon 700d
★  sony a55
  canon t2i
  sony a65
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  nikon d3300
  sony a58
  canon 650d
  nikon d7000
  canon 1100d
  canon rebel
  nikon d90
  nikon d3100
  canon 7 d
  canon eos 600d

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Speaking about nikon d5100, one probably shouldn't forget about lens kit.

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