dash cams

We have these:
Blackvue DR650GW-2CH Dash Cam



Phil

+1 for them but you also need one of these to make it work in parking mode
http://www.blackvue.com/power-magic-pro/
Have installed several and they work really good. Be aware the rear camera is of lesser resolution than the front one.
If you want high res in both you could use these
http://www.blackvue.com/dr650gw-1ch/ for front with WIFI to your phone
http://www.blackvue.com/dr3500-fhd/ for the rear without GPS
They are much cheaper here www.astrobile.com.
I have bought several from them Just make sure you get English versions
Road Guardian also make good ones and the Mini 065 series are also quite good.
Blackvue have the tidiest fitting and are hard to see from outside the car.
I use this to attach them so I can use in a different car when necessary
http://www.bunnings.com.au/scotch-extreme-fasteners-black-2-5cm-x-7-6cm-strips-2-pack_p3950368
Have never had on fall off in more than 3 years of use

What vehicle are you going to use it in so I can offer wiring suggestions

I have a Blackvue for the front. I bought it with 2 holders and 2 wiring kits which plug into the cigarette lighter, so it is quick and easy to transfer it from one vehicle to another (Land Cruiser & ute). In my 1975 Holden ute the cig socket is live all the time so it works for park mode. But in my wifes' RAV the cigarette socket is live only when the key is switched on, so the park mode is inoperable in your absence. Additional wiring is necessary to make it live all the time.
I keep a spare micro card in my wallet.