...as far as i know my car has vanished into thin air, i have no idea how it got away...
My sympathies on the loss of your 500. Hopefully the insurance will go to some way towards replacing it with another 500.
any way my point in combining those two would be...... if its takes 30 mins to remove the claw they wont be there with a alarm blairing for 30 mins before they can get away with it... too much hastle.... thats what im hoping!
My OH had
quite a bit of stuff stolen from her MiTo and it would appear that she didn't lock the car correctly

. Have noticed that the remote has got 'lazy' and does not work from the same distance. Since then she was become a lot more vigilant leaving everything out of sight. She's 'on the road' quite a bit and is appreciative of the security of
deadlocks, the 'Fiat' Meta Thatcham Category 1 alarm and of course the peace of mind of the immobiliser. Everything is carried in the boot along with samples, laptop, etc. but the high value stuff in brought in at night. All personal information and key codes

(left in the car manual wallet) have been removed.
If you decide to get another 500 this is what you can do...
1. Fit a Meta alarm which will bring the Thatcham rating from 2 to a 2-1.
2. Fit a mechanical immobilser that's Thatcham approved (Click
here and select passenger cars).
3. Get the glass etched & you could consider some of these
other recommended options.
They has been a lot of discussion about Alarms and their effectiveness but since a good alarm system has motion sensors an alarm is set off if it's lifted onto a truck and that attracts attention. Plus if they break in it cuts down on the amount of time they have to 'look around'.
I was of the belief that fitting a steering wheel lock on a modern day car was a waste of time. But after 'hearing' of a reported number of airbags thefts this easy to use
StopLock Pro Steering lock protects against it and
might act as a deterrent.
I have a
disklok but it's too cumbersome to use and on the one that I have it does not clear the boss of the steering wheel without scratching it. Anyway it's overkill and not very female friendly. Big issue with it is the weight and getting it under the passenger seat so that it wouldn't become a flying missile in the event of a mishap - so I don't bother using it. Have seen other devices that
lock the pedals but again a bit of a pain.
In relation to keys and where they're kept - my house is alarmed with a panic button in bedroom so I'm not too bothered. Security is as strong as the weakest link.
Anyway hopefully you'll be able to put 'it all behind you' and 'fingers crossed' your next car wouldn't suffer the same fate.