Thanks for the input, guys! While I would like to eventually get a better video camera for general use, I did opt to buy the Motorsports Hero. The site claims the new 5MP camera has improved audio and video. We shall see. I went for the Hero for two reasons:
1) Is small, shoots 5MP still photos as well as video, and it already comes with everything I need for mounting to the car/helmet/interior; and
2) I accidentally got a decent discount... a Hero with 2GB card shipped to my door for $177.
You might be able to get the discount on purpose. Check this out - Visit the site at http://www.goprocamera.com/ and add a camera with 2MB memory card to your cart. Fill in all of the info needed to place an order, particularly your e-mail address. Continue on to the payment page, but don't fill in your CC info. Instead, either navigate to another site or close the window. I received an e-mail within the hour inticing me to complete my order with a 10% discount and free shipping, a savings of ~$34.
The Hero was a tough toy to pass up at that price. I'll be sure to shoot some video at my June autocross event and post it here.