i have an alarm pager, works well within about 500 feet or so...
there is no substitute for having a bat by your bed and beating the shit out of someone if your car pages you asking for help LOL
i'm going to look into the cell phone thing, but I have a feeling if i'm more then 500ft away the car will already be gone anyways. no kill switch or any technology will stop a determined thief.
also jan 1st, 2007 i'll be eligable for a policy for classic cars (needs to be 20+ yrs old, and it goes by the manufactured year, so my 88 will be eligable).
you need to:
1) be 25+
2) drive under 5000mi/yr
3) store the car indoors at home (garage)
4) have documents / photos to substantiate value
then you can basically insure it for any "stated" value you wish. I was quoted around $500/yr, and that is FULL comprehensive AND collision for $100,000 coverage of property damage with a stated value of $30,000 for my supra.
my insurance now I pay $400/yr (unlimited mileage, $100k coverage as well) but if it gets totaled or stolen, I only get bluebook value (about $3500)