Have you tried some of the fairly cheap alternatives? You can probably make your home look impregnable by some deterrents, build up on all of them. Maybe it might attract the hardcore criminal though...
- Cacti and/or thorny bushes under your windows
- Alarm company sign
- Wind chimes on the front/back doors
- Door lock on backyard is visibly showing that it is locked (eg silver latch on brown, black latch on white)
- Picket fence around lawn
- "Prison bars" on window (maybe something not black, so it doesn't look so bad)
There are more that can be covered, can't remember them all off the top of my head.