Your software discs that came with your Canon should have the Mac versions installed, and updates can be obtained from Canon's website.
You should be able to transfer licence code from PC to Mac, or the latest versions use the same code for both bits of software.
I made the switch to Mac because I didn't like Windows Vista and I don't regret the move, but there are some things OSX does better and some things Windows does better, and if on the whole you are happy with Windows, there are ways to make Windows 8 behave like Windows 7.