LoJack has worked great for us.. We have installed it on a few cars @ the shop.. I have them installed in areas that you will have to diassemble half the car to find them.. If the car is been transported on a trailer.. you get a phone call in 5 minutes..
Ravelco- That system has not worked that great for us..
Kill switches are good but as long a you don't cut the juice to the battery.. With any late model engine conversions.. Keep constant juice on the ECM.. their are several ways to keep the car from firing it up with LS engines..
FYI- If you ever plan on using the car as get away car .. Ditch the LoJack & your cell phone!!!