The best replacement for barb is monk.

The best alternatives to barb are rated as following:
★★★★★  monk
★★★  compression fitting
★★★  demon hunter
★★  crusader
★★  monk diablo 3
★★  mfl
★★  monk tank
★★  dh
★  monk inferno
★  smiter
★  monk d3
  barb
  conq
  monk mp10
  betta
  monk better
  monk better tank
  compression water cooling
  rosy barb

Your alternative for barb is not listed? Suggest!
Speaking about barb, one probably shouldn't forget about neon tetra.

Other search terms related to barb and their ratings are:
★★★★★ neon tetra
jack dempsey
You have in mind a companion for barb and it is not yet here? Propose!



Google Trends

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barb
monk
compression fitting