Got my dashcam today, this thing rocks. I ended up getting the "E-Prance Mini 0803" as recommended here by Techmoan, and mine shaft tested and roll approved by our own Seanz0rz.
It does 1280p, but I'm using the 1080p HD mode with sound, stored on a 32gb Class 10 SD card (only $17!), and mounted behind the rearview mirror on my daily driver Nissan Leaf.
The rearview mirror has power for the auto-dimming feature, so the easiest route was to tap the mirror with a small 12V to 5V micro usb transformer I bought on amazon shown here:
I used double stick tape to attach the tranformer to the back of the mirror. Then I needed to hide the 5' cord. Rather than learning how to shorten a USB cable, I stuffed the excess cable inside a piece of heatshrink and double stick taped it to the back of the mirror as well.
And here is the view inside the car; nothing to see here:
This is what you see if you look behind the mirror:
Video quality is excellent. We all know Youtube drastically compresses video, so this doesn't do it justice at all, but at least you can see the wide angle view. **Be sure to change the video quality to 1080p HD in Youtube by clicking on the little gear icon--otherwise, it's not even worth watching.**
http://www.youtube.com/watch?v=XPus6UnyyyE
In the raw video you can very clearly read street signs, license plate numbers, all the important things.
Bob and Sean, thanks for talking me into this. I hope I don't ever need to use the footage, but if I do, I'm glad its there.