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Which are the best ones to buy,price and technical, please

Hi there,
There are many out there to choose from. Here is a link to an article we have written.
I would speak to a supplier for advise to suit your application. Maybe Repco, SuperCheap ect, as these guys will give you good after sales backup, rather than a cheap product from an unknown supplier.
http://www.aa.co.nz/cars/motoring-blog/motoring-advice/catch-everything-on-camera/