go for an alarm that is thatcham rated, 1 being the best, should take at least 10 mins to fool a would be thief, go one better and fit a GSM/GPS tracker :wink:
ive got one similar to this...
http://cgi.ebay.co.uk/GPS-TRACKER-CAR-VEHICLE-BOAT-GPRS-GSM-ANTI-THEFT-UK_W0QQitemZ140259081963QQcmdZViewItem?hash=item140259081963&_trkparms=39%3A1%7C66%3A4%7C65%3A1%7C240%3A1318&_trksid=p3286.c0.m14" onclick="window.open(this.href);return false;
not fitted yet, but it will enable me to listen to the theives :twisted: