Use BootCamp and Windows 7 x64. I am not sure if Apple have released a version of BootCamp that will work with Windows 8 yet. They hadn't as of a week or so ago for my Late 2011 Mac Mini. You will want to confirm this on the Apple website.
Search the forums there are many posts on running SolidWorks on a Mac. Check the More Like This sidebar to the right.
Now i can move foward.