This reply is short because when i hit spell check on my reply 2 minutes ago, IE decided it needed to close and everything vaporized.
I also need to preface these remarks with the fact that I'm just looking for an HD helmet cam for fun jumping, would like a picture better than Std Def, and am not a high level video pro trying taking 3d IMAX pictures from my helmet. That is to say, Im not worried about theoretical "this has higher bit rate than that." I judge subjectively about the overall quality of experience from filming to playback.
I jumped 3 models this weekend:Sanyo Xacti, Panasonic SD7, and the Sony CX7. The Xacti won in my opinion:smallest, lightest, simplest to operate. best freeze frames, 2nd best color saturation, no stability issues. The PC1000 boxes are way too big-I used an open L-bracket from Bonehead made of carbon fiber. The whole setup worked great. I was looking for a sidemount.
The panasonic was light, worked well as a sidemount, but for some reason the picture wasn't really better than a good Std Def.
The Sony had the best color saturation, but i thought it was too heavy compared to the others. It also seemed best set up for top mount. It has the most complex menu and controls, so if you're a fiddler you might like it. I'm not-I'm there to jump. Also the Sony had no way of putting out HDMI short of buying an optional kit, so we were forced to use the rca cables.