The best replacement for nx1000 is nx300.

The best alternatives to nx1000 are rated as following:
★★★★★  nx300
★★★★★  nx1100
★★★★★  nx2000
★★★★★  nx210
★★★  nex 3n
★★★  nex-3nl
★★  nx200
★★  nikon j1
★★  j1
★  nx100
★  nex 5
★  nex-5r
★  sony nex 5n
★  nex5r
★  nex 5r
  canon eos m
  galaxy camera
  sony nex c3

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Other search terms related to nx1000 and their ratings are:
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nx1000
nx300
nx1100