Go for the waterproof (motorsport) one or more importantly dirt proof.
I don't like them they just poke out to far for enduro use, the amount of times you clout overhanging branches cant see it remaining on the helmet for too long...might be just me
IMHO opinion the ContourHD is a far superior product and worth the extra money..will get one myself one day You might be able to get one from the States for a lot less but watch out for the custom duty.
GoPro HD
ContourHD
Not a lot of difference when you upload to you tube
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You might be able to get one from the States for a lot less but watch out for the custom duty. 
