as above get the best you can affors, my dad has an avital maxx 2 i believe on his van its quite a good alarm, ive hered good things about the clifford g5's.
be aware descent alarms are big £££, and to get insurance accreditation it has to be fitted by a proffesional and have a certificate to prove it.
p.s. your package was picked up at lunchtime yesterday.