The best replacement for harbeth is spendor.

The best alternatives to harbeth are rated as following:
★★★★★  spendor
★★★★★  proac
★★★★  dynaudio
★★★  sonus faber
★★★  atc
★★  totem
★★  pmc
★★  devore
★★  stirling
★★  tannoy
★  magnepan
★  audio note
  thiel
  vandersteen

Your alternative for harbeth is not listed? Suggest!
Speaking about harbeth, one probably shouldn't forget about mcintosh.

Other search terms related to harbeth and their ratings are:
★★★★★ mcintosh
★★★ naim
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Google Trends

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harbeth
spendor
proac