The best replacement for thank you is thanks.

The best alternatives to thank you are rated as following:
★★★★★  thanks
★★★  thank-you
★★★  thank you
★★  regards
★★  sincerely
★★  appreciate
★★  best regards
★  thank you very much
★  simplicity
★  citi diamond
★  thank you preferred
  thanking you
  chase freedom
  good asl
  citi preferred
  thanks a lot
  your welcome
  no problem
  good job
  kind regards
  thanks you

Your alternative for thank you is not listed? Suggest!
Speaking about thank you, one probably shouldn't forget about candy sayings.

Other search terms related to thank you and their ratings are:

★★★★★ candy sayings
★★★★★ saying thank you
★★★★ your help
★★ flowers images
★★ using thank you
★★ flowers pictures
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Google Trends

Scale is based on the average worldwide traffic of thank you in all years. Click on graph for more.
thank you