Dont laugh, but this one

http://www.amazon.com/gp/product/B00B2383T4?psc=1&redirect=true&ref_=oh_aui_detailpage_o09_s00

Its surprisingly good and the video and audio are clear and actually 1080p. And its only 20 bucks, and the FOV can see slightly through the back windows behind the b pillar, as well as the shifter and the gauges. I can read what speed i was going and what rpms im at when im sitting normally in the seat. Its mounted in the center at the top of the rear window.

Hope this info helped! I find its more functional capturing the inside of the car as well as out the windows.