The best replacement for sonar 8 is cubase 5.

The best alternatives to sonar 8 are rated as following:
★★★★★  cubase 5
★★★  sonar x1
★  nuendo 4
★  pro tools 8
  sonar 7
  sonar 6
  protools 8

Your alternative for sonar 8 is not listed? Suggest!
Speaking about sonar 8, one probably shouldn't forget about asio4all.

Other search terms related to sonar 8 and their ratings are:
★★★★★ asio4all
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Google Trends

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sonar 8
cubase 5
sonar x1