The best replacement for sidi is shimano.

The best alternatives to sidi are rated as following:
★★★★★  shimano
★★★★★  alpinestars
★★★★  specialized shoes
★★★★  gaerne
★★★  shimano shoes
★★  mavic
★★  giro
★★  giro sizing
★★  spidi
★  alpinestars boots
★  s-works
★  shimano sizing
★  bont
★  dmt
★  sfi
★  alpinestar
  tcx
  fizik
  shimano shoe sizing
  northwave
  diadora
  oxtar
  alloytec
  giro shoes

Your alternative for sidi is not listed? Suggest!
Speaking about sidi, one probably shouldn't forget about speedplay.

Other search terms related to sidi and their ratings are:
★★★★★ speedplay
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Google Trends

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sidi
shimano
alpinestars