While I have had cars with kill switches, chains on the hood, and even got "the club" as a christmas gift, now a days a flat bed tow truck will haul off any car with those simple means of deterring a thief.
I have not tried low-jack. While it will not prevent a theft, maybe you have a really good chance at a quick recovery?
I drive most of my vehicles often. I think the key is just being smart where you park, and checking in on your car (every 20-30 minutes for me, keeps me sane)
While I kidded about why this vette was stolen, I really don't care if it was a $1000 car. It pisses me off when people steal others property that they worked hard for or may have received as a gift. I had my first car stolen. It sucked at the time, since it was a car I worked for years saving up for, purchased and then restored with my uncle. If someone wants your car bad enough, almost no amount of security is going to prevent it from getting stolen.
That being said, just think about where your car is getting parked and for how long. Especially large car shows. Or overnight parking for a car event. That seems like a hot bed for thieves to show up with a trailer or flatbed, and make off with someones pride and joy.
In the end you only live once, so you gotta drive em.
Just my 2 cents