We had the Amazing Bottle Dancers perform at my older son's bar mitzvah in Villanova, PA in 2007 and were very happy. It went just as you said and they were a hit!
My younger son's bar mitzvah is this spring and I initially ruled out the bottle dancers. However, I've yet to find an idea that would top the bottle dancers and I'm wondering if you can make a repeat performance?
Look forward to hearing from you,