The best replacement for canon 580ex is 580ex ii.

The best alternatives to canon 580ex are rated as following:
★★★★★  580ex ii
★★★★★  430ex
★★★  550ex
★★  nissin di866
★  canon 580ex ii
★  yongnuo 565ex
★  metz
★  yongnuo 560
★  metz 58
  yongnuo 565
  canon 430ex

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Speaking about canon 580ex, one probably shouldn't forget about pocket wizard.

Other search terms related to canon 580ex and their ratings are:
★★★★★ pocket wizard
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