Thanks for all of you to respond my msg.
first of all, I need a camrecorder even for home use.
so, I'll buy one anyway.
second, on my jumps I'll concentrate on my motion and stability ; the difference is that I'll have a camera on my head.
finally, I have heard that camera on the side of the helmet is safe (not like on top).
I'll be happy to hear your thoughts, and perhaps you could tell me what models should I purchase in New-York/Los-angeles
Thanks again
p.s - what about those JVC (sony is expensive)