I am not sure where you live, but I would look into a garage and a video camera. Although that does not help when you go somewhere. I would look into an aftermarket alarm with a proximity sensor. You could also get a hard top, but what fun is that. My best suggestion would to buy the biggest baddest dog you can find, and let him sleep in the car over night. I don't really know what to say, but always call the cops, and have the finger print the car. Some kids broke into my car once, and they got caught because I called the cops right away, and had the car dusted. They had to pay me $1,600 for damages. But, hearing that does p*ss me off. I hope you catch them. Like John Trovolta said in Pulp Fiction, "It would have been worth having them do it, just to catch them." Good luck. But, I would look into a $650 alarm with prox sensor. I would also invest in a shotgun. Check with your local state laws first though. Here in Louisiana, if you are caught on someone's property after sunset, we have the right to shoot. I love my state!