The best replacement for 430ex ii is 580ex.

The best alternatives to 430ex ii are rated as following:
★★★★★  580ex
★★★★  430ex
★★★★  320ex
★★★  yn-568ex
★★★  420ex
★★★  yongnuo
★★  600ex-rt
★★  600ex
★★  550ex
★★  yn-565ex
★★  580ex ii
★  530 ex ii
★  270ex ii
★  320 ex
★  metz 48
★  canon 580ex ii
  270ex
  nissin di622
  nissin di866
  speedlite 580ex ii
  speedlite 430ex
  canon speedlite 430ex
  580 ex ii

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Speaking about 430ex ii, one probably shouldn't forget about pocketwizard.

Other search terms related to 430ex ii and their ratings are:
★★★★★ pocketwizard
★★★★ 7d
★ t2i
★ 60d
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430ex ii
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