And to answer the question....
I'd pick Steve Perry but it would be Steve Perry around 1980 if I had a choice. But I do think that even today he has that certain *something*.
JSS is a good looking guy and definitely has sex appeal. Plus he's tall. Love me some tall men. Yes, I know SP isn't tall.
I have never gotten SA's appeal. He looks a little too polished and coiffed for my tastes.