Some things to consider:
1. The Panasonic Wireless Camera that I posted above can be set up inside the house facing the outside through a glass window. It does not have night vision, but you can install motion lights outside. A true night vision camera cannot be setup inside facing a window because the night vision LEDs will reflect on the window making it impossible see anything. Night vision cameras for outdoor view have to be setup outdoor.
2. If you setup cameras outside the house, you'll have to drill holes in the wall or roof for the power cable, and the data cable too if the camera isn't wireless.
3. A lot of surveillance cameras out there require a DVR to record. The Panasonic Wireless Camera above does not. It instead sends the images to your phone, email account, and possibly even Yahoo flickr. So if someone breaks into the house and breaks or steals the camera, you will already have the images safely stored at a remote location.