If you decide to have a cesarean section for breech presentation, insist on an ultrasound to confirm the position right before surgery. Otherwise you might end up with a c-section, only to discover the baby was in fact head-down. A L&D nurse tells of one such "surprise vertex" that recently occurred while she was on shift.
Another piece of advice for those who would accept a cesarean for breech presentation: insist on waiting for labor to begin, rather than scheduling the surgery in advance. That way you know the baby is ready to be born, and the baby can even benefit from some early labor. And of course, you might just be surprised to discover that the baby has turned around!