Rob...thanks for doing the research on my question. The funny deal is that I was checking out head lamps in the new Cabela's Fall 2004 catalog. They have a Petzl MYO 3 for $44.99, but it doesn't have the detachable power source. For a few bucks more, I'm sure I'll be happier with the model you suggested.
Much appreciation.

Happiness is a tight line and a stiff pole.