The best replacement for humminbird is lowrance.

The best alternatives to humminbird are rated as following:
★★★★★  lowrance
★★  vexilar
★★  lowrance hds
★  raymarine
★  marcum
★  lowrance down imaging
★  garmin fishfinder
★  furuno
  simrad

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Speaking about humminbird, one probably shouldn't forget about navionics bundle.

Other search terms related to humminbird and their ratings are:
★★★★★ navionics bundle
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humminbird
lowrance
vexilar