I bit the bullet, braced myself, and forked over the $280 for one of these:
http://www.blackvueusa.com/DR500GW-HD.html
Although pricey, I am highly satisfied with the features. I don't see how it works, but it records almost 180 of footage (windshield pillar to windshield pillar) but doesn't appear like it was shot from a "fish eye" lens. It records sound and is able to pivot 180 degrees, as well. This may be handy during a traffic stop, as I can simply reverse it and tilt my mirror (under which I have chosen to mount it) in order to record video and audio of anyone, such as an officer, standing outside my driver's window.
For the price, it also has a cool wireless feature: I can use my smartphone to access its menu where I can save footage being recorded, or select a previously recorded file to save on my phone.
Pricey? Kind of. Worth it? To me, yes.