[onelove]

Have you looked into Traqmate ? Many DE and Club Racers use it, which makes for great data sharing, they're a bit expensive new but with some searching good deals can be had. I've been running these for a bit and it's a great option because not only does the display show your incrementals and lap times in real time on track, but most of my fellow drivers use it, allowing us to compare data and segments on the fly between sessions.

I had the AIM SmartyCam in the past and to be honest, the footage quality was horrible in comparison to GoPro (especially given the cost). I've now switched to a Contour HD and Traq Studio.