Don't open with Stigmata. It's too strong, too early.
You could open saying something like:
Most people think of a magician they think of:
(go into a pick a card trick)
But I want to go beyond that:
(Stigmata)
Just try to make sure that your act builds and each effect is stronger than the last.
How are you presenting that?
MentalAlex has a routine somewhere where you use a Radar Deck on a few people and then divine a thought of person through Stigmata Version 2.
http://forums.theory11.com/showthread.php?t=9214&highlight=radar+stigmata&page=3