Bought 2 of my Mobius cameras from the Car Camera Shop, their customer service is second to none, both Ian and Andy even replied to my e-mails on a Sunday. Delivery is quick and the cameras were very well packaged ( unlike the one I bought from ebay ) and I would recommend them.
They ship the Mobius already set up as a dash cam ( Loop, 180 switch, Auto Power on, etc, etc, etc ) so you just plug and play.
I run a 2 camera set up, Mobius C in the front and Mobius B in the rear, though I started out with an A lens Mobius in the rear and it worked well ( but it had to be set up dead center due to the FOV )
If I was doing it again I'd go with the C lens front and rear.