Questions: How do you secure your AC condenser from theft?

There have been thefts of AC condensers all over my neighborhood lately.  A mild winter has allowed the crime to continue well past when the crackheads usually hibernate.  I just put two central air systems in my house this past summer and would like to keep them through next summer.  Has anyone on here come up with a good way to secure these from theft?  Currently, I have a lock on each of the disconnects so they are at least risking bodily harm to get to the copper.  But that hasn't deterred many of the thefts, they simply risk the shock.  Short of having a giant cage welded around each unit, I'm at a loss for what to do.  Some people have tried building chain link cages around their condensers but that just gets stolen with the unit.   

Considering the cost of scrap copper, a locking structure is in order or moving it to a less visible site on your property. We have tweakers, crackheads and gang bangers coming in at night to our area which is upscale (median home prices ($800K) and stealing tires and ptretty much anything they can remove in a few minutes under the cover of darkness. I lost $7,200 worth of tools in Jan of '04 and now I'm the complete home protection enthusiast. In California, they have the right to take you to court and collect damages due to injury while in the commision of a crime which begs the question, what the hell kind of world do we live in? Personally, I'd rather see someone attempting to commit a crime turned into pink fog but that's just me.