The best replacement for 18-200 is 18-300.

The best alternatives to 18-200 are rated as following:
★★★★★  18-300
★★★★★  18-140
★★★★★  55-200
★★★★  70-300
★★★★  18-135
★★★  18-105
★★★  16-85
★★  55-300
★★  55-250
★★  18-250
★★  70-200
★★  18-270
★★  18-55
★  18-140 nikon
★  24-105
★  18-300 nikon
★  18-300 nikon lens
★  tamron 18-270
★  28-135
★  sigma 18-250
★  55-250 canon
★  sigma 18-200
★  28-300
★  18-135 stm
  tamron 18-200
  canon 18-135
  16-85 nikon
  70-300 canon
  canon 24-105
  18-55 and 55-200
  sigma
  70-300 nikon
  nikon 18-200
  18-135 nikon
  17-55
  canon 18-200

Your alternative for 18-200 is not listed? Suggest!
Speaking about 18-200, one probably shouldn't forget about 60d.

Other search terms related to 18-200 and their ratings are:
★★★★★ 60d
★★★ d7100
You have in mind a companion for 18-200 and it is not yet here? Propose!



Google Trends

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18-200
18-300
18-140