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I just use my 1911 and 00 buckshot...
For 30 you can get a real camerahttp://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=47546
Set out some bait--keep the garage door open again with something that will look enticing. Set up your camcorder in the nearby bushes. Sit in a car nearby and observe. See where they go if they do indeed go back to the neighbor's house. Then Call the cops. BUSTED!
I have a buddy that is setting up some cameras and they can have events attached to them that will actually email the image to you if something moves in front of the camera. Once he has it all working, I will probably see about getting some.