The systems Lojack offer are very good.
I do not work or benefit from Lojack company when I say that here in Denver many club members are getting the Lojack recovery system. Many new car dealers are installing Lojack in the New Birds and also the Roush and Saleen Mustangs after a couple Saleens were stolen out of the dealers lot!
Lojack is maybe three or four months away from a motion device that will call you via any communication device, phone/pager/pda/computer,etc.
They also advertise a convertible perimeter system that will alarm when an intrusion into the open two seater is made.
With todays bad guys stealing your car at gun point, Lojack is a great option in confrontation avoidance(or maybe you got a faster draw and guts to shoot em).
It is the only recovery system used by the police.
It is all over the world and even the Russian Mafia uses it to track their stolen cars.
The motion detection paging will make all of us sleep better no matter where you park your Bird.
Here is the Lojack link
www.lojack.com
Good luck.