Yea I agree, If you are going to spend $1000 + on a super duper alarm it seems a little stupid.
If some one tries to steal your car with the flash alarm, pretty sure they will damage the car in the proccess so even if they don't get away with the car you will still have to claim on insurance to get it fixed. (excess will be the same either way).
With the GPS thingy, I don't know about anyone else but when your car gets stolen and then recovered a couple of days later its never the same. Some times I thinks its almost better to lose it completely and start again with a new one. Only positive is that there is a chance they could catch the theives.
If you are sensible about where you park and don't have big flashy accessories like cromes and huge guages then I would doubt you would have any problems
Good insurance helps to
What part of the country are you in?