These ones seem to get decent reviews for the price. There's a few youtube videos of them and the video quality looks very good to me. I can't tell if the capacitor model is the way to go or not. Why doesn't a major player like Sony or Samsung make these?
http://www.amazon.com/gp/product/B00...A2RW7SPXB2R3QE
http://www.amazon.com/Recorder-Dashb...&keywords=g1wh