I can sympathize with you on the kind of responses you are getting. The "ignore list" feature is very useful here. I wear a camera on the road (shut it off on the bike path), and have turned in multiple incidents to law enforcement, resulting in multiple tickets being issued. Here is an example of the kind of reactions you get if you post a successful prosecution of an offender on bikeforums:
http://www.bikeforums.net/advocacy-s...uzzed-bus.html

I use Replay XD cameras, and really like them, but the company seems to have gone into hibernation, so I can't give them a recommendation. I used to use the Contour cameras, but they have such a wide-angle lens (170 degrees), that it makes it difficult to catch a license plate on an oncoming car. However, they share the ability to rotate the unit to any angle to level the image, which is very useful on a helmet.