The best replacement for 28-300 is 70-200.

The best alternatives to 28-300 are rated as following:
★★★★★  70-200
★★★★★  70-300
★★★  18-200
★★★  24-70
★★★  70-200 canon
★★★  18-300
★★★  24-120
★★  24-85
★★  18-270
★★  100-400
★  24-120 nikon
★  nikon 28-300
★  24-105
★  80-400
★  tamron 18-270
  24-85 nikon
  18-200 nikon
  sigma 28-300
  tamron 28-300
  nikon 55-300
  nikon 70-300
  70-200 f4
  70-300 nikon
  nikkor 28-300
  tamron 28-270
  50-500
  35-350
  nikkor 24-120

Your alternative for 28-300 is not listed? Suggest!
Speaking about 28-300, one probably shouldn't forget about d600.

Other search terms related to 28-300 and their ratings are:
★★★★★ d600
d800
You have in mind a companion for 28-300 and it is not yet here? Propose!



Google Trends

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28-300
70-200
70-300