Security Alarms

Hello!
Today I couldn’t find my Sat Nav which was in car’d dashboard. I can’t believe sum1 actually got in the card stole the sat nav and wasn’t bothered to take the car lol. May be i can’t remember and its actually somewhere in my room. But I really feel i need a car alarm system. Car is Astra 1.8 and it already has the immobilizer but i want a simple alarm system which will start shouting when someone touches the car. any suggestions which one is the best? i was looking at ebay and found 2 terms there, 2 way alarm system and 1 way alarm system. what is the difference between the two?

Thanks a lot for reading:-)

p.s i want something which is easily available in UK:-)

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