arnoldwei

ILDVR has 1080P AHD 8ch system lower than $300 without HDD (DVR+cameras).

"the cameras would have to be placed in the yard as opposed to on the house" this is not good design, the camera is easy to be tampered.

To prevent the false motion alarm notification, best choice is Intelligent Video Analytice alarm push notification. You can refer to here http://www.ildvr.com/products/invs-9100-series

IP Matrix is a good choice, like this:

http://www.ildvr.com/products/video-wall-hardware

The best solution is using NVR IVA alarm push function, like Intrusion Detection Alarm Push or Tripwire Detection Alarm Push. The IVA function in IP camera is poor because its processor is low speed. By IVA alarm, you can define the moving object minimum size and maximum size, moving speed, moving dierction, video detection area and tripwire etc. These configurations could greatly elliminate a lot of false alarm usually generated by Motion Detection. Combing with Alarm Push function, you can recieve alarm message and grabbed picture. Amazon has this type of NVR, it is ILDVR brand name.

ILDVR InVS meet your requirements

ILDVR InVS with IVA Alarm Push function is the best NVR on the market. You can save money.

It is very simple, many NVR support dual monitors output.