Hi guys,
Been thinking about getting a dashcam for a while but an incident last night got me more geared up to obtain one which I will do today all being well.

Was driving down the M6 when the car in front started wandering a little between lanes... suddenly, he slammed his brakes on and guess what, no brake lights...

This meant my reaction time was slower than usual as it wasn't until I noticed the distance closing fast that I reacted, as opposed to seeing his brake lights come on. So... I didnt hit the clown, (who i suspect nodded off and woke up with a start) and was able to just steer round him but it occured to me that, being behind him, had I hit him I would by default be the driver at fault and it would have been handy to prove how events unfolded...

So, does anyone on here use them and if so, what can you recommend.
I want one with GPS so I can prove times, dates and speed too. Would also be interested if there are any out there with an external cam input that also record the view behind.