The best replacement for dual wield is 2h monk.

The best alternatives to dual wield are rated as following:
★★★★★  2h monk
★★★★  2h skyrim
★★★★  shield skyrim
★★★★  2h frost dk
★★★  2h runescape
★★★  2h
★★★  2 hand
★★★  two handed
★★★  2h brewmaster
★★  one handed dcuo
★★  two hand
★★  quiver
★★  2h frost
★★  2h demon hunter
★★  2h monk wow
★  2h monk pvp
★  2h barb
★  2h for death knight tank
★  2h monk brewmaster
★  2h diablo 3
★  2h death knight
★  two handed skyrim
★  skorn
★  2h unholy dk
★  2 hander
★  2 handed
★  2h hunter
★  2h ww barb
★  2h for monk
★  2h barbarian
★  polearm
★  2h dk
  2hand
  sword and shield
  2h barbarian d3
  deadliness
  opportunity
  shield diablo 3
  sword and shield skyrim

Your alternative for dual wield is not listed? Suggest!
Speaking about dual wield, one probably shouldn't forget about dk.

Other search terms related to dual wield and their ratings are:
★★★★★ dk
★★ death knight
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Google Trends

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dual wield
2h monk
2h skyrim