A couple links of interest on this topic... (more back-up material to support the original post)
Why hard-top vehicles are safe:
http://en.wikipedia.org/wiki/Faraday_cage
Statement that convertibles are not safe:
http://www.struckbylightning.org/resources/game.pps
Now, given the choice between sitting in the metal bleachers in the game link (that one made me laugh out loud) or riding the storm out in your Boxster, go with the Boxster...
