The best replacement for d7100 is d600.

The best alternatives to d7100 are rated as following:
★★★★★  d600
★★★★★  d7000
★★★★  d610
★★★★  d5200
★★★★  70d
★★★  d5300
★★★  d800
★★  d300s
★★  d700
★★  d90
★★  7d
★  canon 70d
★  d5100
★  d3200
★  nikon d7000
★  60d
★  6d
★  nikon d600
★  k3
  canon 6d
  d7200
  5d mark iii
  d3300
  nikon d5200
  d300
  a77
  fuji xe1
  canon eos 70d
  d80
  nex-7
  canon 7d
  canon eos 7d
  d3100

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Speaking about d7100, one probably shouldn't forget about 18-200.

Other search terms related to d7100 and their ratings are:
★★★★★ 18-200
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