It's very easy, just make it less attractive to a pikey than other peoples cars.
I'd start with the basic alarm/immoby, it's all very well people saying if they want it they will get it, but putting mr realistic head on tells you a pro is not going to bother with your car in the first place, so determine who your target "audience" is.
I would use a toad either a ai606 or C5T2, which is my fave, the pedal device in the link I can get off in less than 5 seconds with ZERO mark let alone damage to the car.
Being fussy where you park it will have more effect than you'd imagine, a tracker is a good idea, but seriously anything remotely vigilante, although a nice feeling would land you a free "holiday", it could also back fire, so you spend the rest of your life worrying looking over your shoulder, put this way kill a pikey, although you are doing a public service imo, they won't leave it unanswered, and it don't matter who you are, or what you are capable of, for a bit of metal do you really want to expose you/family to danger for the rest of your life ?.
tabetha