RE: which on board camera
OK then - Hobby Lobby's FlyCamOne2 is about $75, comes with a mount, does 640x480 30fps (not bad), and weighs about 1.6 ounces with mount and an SD card. On the cheaper end, a Tony Hawk helmet cam can be had for probably $30, does 320x240 at 15fps (significantly worse than the Flycam), and weighs in at about 3.5 ounces with batteries, SD card and mount. A flip Mino (either SD or HD) are very nice, self-contained for less than $200, and weigh 3.3 ounces (you would need to fabricate a mount.)
What do you think?...Chris