Which car do you drive more often? Why not park the bug outside?
I parked my GSR on the street in San Jose

for a month; it's still intact.
No amount of theft protection is going to *prevent* a thief from stealing your car while you sleep. All those autolocks and whatnot will make it much harder for someone to break-in and drive away during your lunch break, but if it's on the street and you're sound asleep, it usually means bad news.
Shingo