The best replacement for 430ex is 430ex ii.

The best alternatives to 430ex are rated as following:
★★★★★  430ex ii
★★★★  600ex
★★★  580ex
★★★  550ex
★★★  270ex
★★★  420ex
★★★  320ex
★★  580ex ii
★  430ez
★  580ex flash
★  530ex
★  di622
★  di866
  canon 580ex
  565ex
  speedlite 580ex
  568ex
  430exii
  sb600
  st e2
  430ex ll
  built in flash

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

Other search terms related to 430ex and their ratings are:
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430ex
430ex ii
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