Contour Roam
It's essier to turn on and off while it's on your head with its massive slide switch, you don't have to take it out of any housing, comes with a swivel mount perfect for quick on and off the helmet, it's a lot cheaper than most other models and it has decent mage quality.
About $100 on sale most places.
My most recent clip from my Contour Roam.
Link to original page on YouTube.