insurance is the best safety for your vehicle. you just pay 2.25% of value of your car each year. it covers each and every type of accident/theft/snatching/damage/theft of accessories with total peace of mind.
tracker is not recommended since first of all it will play with wiring of your vehicle, secondly, a seasoned thief/snatcher knows very well how to disable it making it useless and the car is gone forever.
extended warranty will simply increase engine warranty for few more thousand KMs, whereas you will not get protection against any other losses which are the most likely to happen like accidents/thefts/snatchings/burglaries. usually Engines do not go bad this early so these payments of extended warranties etc goes useless most of the time.
talking with my experiences with Insurance sector. you can ask further here in case of any clarifications.