I personally don't think there is one. You just have to be in the moment, stand natural, put your hands up and be ready is what I say...but nothing specific.
*** Other guys will disagree with me on this but I think kung fu in general works best when you counter your opponent. That is specifically, if you can get the other guy to give you energy then it works so much better.
That isn't to say that you can't attack with KF, sure you can. ( you can also attack to get a response ) I realize that allot people prefer "Attack is the best defense" method and some styles are more geared up for that. I'm just telling you my own preference.
But since you asked, I think the people out there that have a fantasy version of what KF should look like in a fight will probably vote for someone standing LOW in a horse stance. Perhaps with the Kiu Sao extended or mabe the classic Wong Fei Hung Pose ala "Asking hand".
But IMO, there's no reason to display your stance of readiness or what you do to the other person.
It's nice to take photos like this (
http://i80.photobucket.com/albums/j1...HSF%20pose.jpg ) for a shoot but I'd never stand like that for a fight...it would just waste energy.