I drive a car with a soft top, so its even worse for me than a jimmy'd lock or a smashed window.  We're talking 3K for a new top.  
As mentioned above, I leave NOTHING in the car.  No chargers, no loose change in the cupholder, no papers, no pens even.  Nothing.  Thieves will be lured by ANYTHING.  And I leave the car unlocked.
If I have something in the cab of the car that I just can't take with me (rare), I lock it in the trunk and disable the trunk release.
I once had ALL my gear stolen in one shot.  Silly me loaded up the car the night before a trip.  6 rods and reels and all my bass fishing gear, which was hard to accumulate back 20 years ago.  Funny thing, I found a bunch my bass gear for sale at a pawn shop in Westbank 6-7 years later.  I knew it was mine as it had my own custom home made spinner baits and such in my tackle box.  A Plano box with an Abu sticker I put on the side.  No coincidence there...