Check to see which, if any, will work with a helmet cam. That way, you can record handsfree... Basically, the camera need to do video in - but not through the lens - through the AV jack. And while helpful, it is not necessary to have a LANC connector... Even if you don't do this immediately, plan ahead so if you *want* to, you can...

EXAMPLE ONLY: http://www.viosport.com/


Are you locked into Canon for any particular reason?