The best replacement for nikon d800 is d800e.

The best alternatives to nikon d800 are rated as following:
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★★  canon 5d mark iii
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★  df
★  canon 5d
★  canon mark iii
  d3s
  nikon d700
  nikon d600
  nikon d800e
  d3x
  nikon df
  sony a99
  canon 5d mk iii
  canon 5d mark 3
  nikon d4
  canon 5d iii
  canon 5d mark ii
  sony a7
  canon eos 7d

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Speaking about nikon d800, one probably shouldn't forget about lens kit.

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