with ref to the stalker - bwhahaha - sorry! I had an old man who usd to stalk me at the pool when i was younger - scary!
what about trying one of these IP cameras with mtoion detection. They can simply store the pics on a NAS drive in the car so power useage would be minimal.
alternatively, go with a low power SBC and get one of these PC104 video capture boards. you can pick up a P3 1ghz which will spank on an epia 1ghz and should be faster than a 1.3. you will lose stuff like USB2 etc etc but you can add these with another pc104 card.
actually...looking back at your DVR driveway issue...IP cams would be good as they can send direct to your home network when in range or to a web server for uploading to a site and send you an email. But i would judt have cameras at your house all the time. that way your house is monitored when your car is not there.