Had they tried to take the battery or had you disconnected it? What tools they taken? Dont say the spring compressers, I ordered my eibachs at the weekend!
There was a story once about this chap (a Sierra Cosworth owner I think)who was so fed up with people attempting to steal his car that he wired up his battery so that anyone who touched the bodywork got a nasty electric shock. Turn's out some car thief managed to successfully sue him for damages, but personally I think he had the right idea.
Hmm with all the "keep it comments" Im lost for what to do!
This has to be one of the hardest choices i have had to make.