The best replacement for audigy is live.

The best alternatives to audigy are rated as following:
★★★★★  live
★★★★★  realtek
★★★★★  onboard
★★★★  x-fi
★★★★  audigy 2
★★★★  xonar
★★  onboard sound
★★  realtek hd
★★  xonar dg
★★  sound blaster live
★  m-audio
★  x fi
★  onboard audio
★  ac97
★  realtek alc889
  hd audio
  soundmax
  santa cruz
  soundstorm
  xi fi
  sb live
  xfi
  sound blaster audigy 2
  asus xonar
  live 5.1

Your alternative for audigy is not listed? Suggest!
Speaking about audigy, one probably shouldn't forget about live drive.

Other search terms related to audigy and their ratings are:
★★★★★ live drive
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Google Trends

Scale is based on the average worldwide traffic of audigy in all years. Click on graph for more.
audigy
live
realtek