I _only_ use the BlackBerry branded car charger. I've learned the hard way, and now only use chargers from the mfg of the phone. You can find these online at a good price, thus there is no reason to shortcut and use brand X. Why risk a BB that costs a few hundred dollars.
My All Time Favorite: _RED-8310_ Backups: 7130c, 8100, O2 8300, at&t 8300, 8700c, 8800, 8820