Just go the full works...
I'm talking a sophisticated system with motion sensors, alarms, immobolisers, GPS tracking units, wheel locks, kill switches, detachable steering wheel with lock.
Install a few kill switches in visible locations and then more kill switches in non visible locations.
Heck, carry around four of these in the car so that when you park you know you're not getting towed in a hurry.
Its reasonable to assume there is chop shops operating right now...so be careful.