what i feel is that a pedal lock and a steering lock should be sufficient la...the steering lock though useless is more for telling them not to try because I have a steering lock on, then maybe some motion sensor and shock sensor installed....
connect your alarm to your blooody loud honk to get extra attention, though it is sometimes irritating but it really saves your car...
oh yah, for most car there will be a bypass alarm button below the steering lock, maybe you can disable that la...cause some thief actually has GTI's master key, so what alarm also no use....he will stick in the key and press the button to shut your alarm system, then he will have his own sweet time to tackle whatever security systems you have,....
just my two cents