The best replacement for d610 is d800.

The best alternatives to d610 are rated as following:
★★★★★  d800
★★★★★  d600
★★★★  d7100
★★★  6d
★★★  d700
★★  d7000
★★  5d mark iii
★★  df
★★  d4
★  d810
★  a7
★  d620
★  d630
★  d90
★  d5300
★  d5200
★  dell d620
★  d510
★  d300s
  d3
  5d mark ii
  d600 review
  canon 5dmark3
  600m
  700m
  dell d600
  d800e

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Speaking about d610, one probably shouldn't forget about nikon 24-70.

Other search terms related to d610 and their ratings are:
★★★★★ nikon 24-70
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