Data and video is one of the most confusing topics (at least to me).
After using GoPro's and then wiring power and remote start/stop, I decided to bite the bullet and buy a dedicated system. I ended up with the TraqMate TraqDash HD. The color display is really nice and the data logger can control two cameras. For cameras, I bought two Mobius HD cams. They integrate seamlessly and the video quality is fantastic ($1,299 bundle).
Data analysis is accomplished via TraqStudio and video/data overlays via Race Render 3, Dashware, etc. I have used TraqStudio and it is very easy to use. I have not used Race Render 3 or Dashware yet.
TraqDashHD