The Optex 2000, as U1 indicated, looks solid.
For the NVR case, I have used a couple different Dahua models with Dahua PTZ's and I/O triggering. Would be wary though if not using Dahua PTZ...
Are you looking for something optical, PIR, or a buried loop? Would one of those options be more or less prone to issues in this driveway?
Buried sensors are generally the best for avoiding false alarms, but you have to bury them, obviously. There are some you bury next to the driveway instead of under, but they're not as accurate.
FWIW, I haven't tested it, but I'm probably going to be buying a Dakota Alert DCMA-2500 for my driveway. It claims 1/2 mile range and the receiver has relay outputs. It's pretty well reviewed and a fairly cheap entry point (~$150).
IPVMU Certified | 12/08/15 03:40pm
I've used the Dakota alert stuff a fair amount. Consumer level, but works well and the company is really cool to work with