I've got an old school friend who is a Clifford installer. I chose him because I know his work is top notch - I was trained as an auto electrician at Vauxhall Motors so i'm a fussy git when it comes to wiring.
So I ended up with an Intelliguard 850, it has all the addtional sensors on it and even has 2 blue flashing Clifford stickers to le the thieves know
I particularily like the anti-hijack - doors lock as soon as i drive off and the security keypad which means I have to type in a security code each time i get in the car if not after 30 second the alarm sound, lights flash and the engine cuts out.
Nice to know that even if some little bugger nicks the keys they can't get too far
Paul