Most quality broadheads will work for bear - if hit in the right spot. I was not a fan of expandables until my wife tried one last year on her bear. She shot her bear with a 10-Point using a Spitfire. No problem following that bloodtrail. Took a long time to clean up the site for field photos.
About the only thing I would say now is that I am not a big fan of the mini heads. Definately will work if you hit a bear properly, but I've trailed a lot of bears at dusk (the time the majority of our bears are shot) and nothing beats a profuse blood trail when trailing a bear in thick woods by flashlight or lantern.