Matt,
Seriously, you need a garage. I can tell you for sure that Escort Cosworth's still get stolen from driveways no matter how good your security is.
Even when you have a garage, you need to make sure that the it is a secure one. An alarmed garage with strong doors/locks is a MUST !! Also, other precautions are advisable, like making sure that are not followed home so that the fookers know where the car is kept. If you think you are bring followed, then best to drive past your house - judt to make sure.
Maybe we should all be glad that with the multitude of Subaru's/EVO's/Civic Type R's etc...etc out there, our Escort Cosworth's are still extremelly desirable, despite being 9 - 14 year old cars!!