Tom
I had mentioned the Gotcha software for survalence that allows any computer at any remote location to record all activity within view of any camera that connects to that computer. The camera triggers the computer to record *only* when the scene changes. Have you considered Gotcha? It sure is an inexpensive system since you already have the computer and probably a camera or two around.
X-10 has wireless cameras.
Low light/IR cameras are available for not too much money. Low voltage on some flood lights can provide alot of IR without producing alot of visable light.
Jerry