Counterpoint, the HV20 has some cheap pieces on it that are a little more prone to damage (this from the guy who has a dent and scratches on his HC7 - from the BoneHead Composites carbon fiber helmetcam box).
The point I wanted to find, do you need external audio, external monitor (headphones), more manual controls, LANC, specific hotshoe? Each help decide. The Canon's have slightly better pics and 24p (but Canon does not do the stream correctly with the pulldown signal - you will need to find some of the user apps popping up that will do the pulldown - 24p is inside a 60i stream).
The HV10 is about $700, but is pistol grip form factor. The HV20 is the same form factor as the HC5/7.