number 4 is just stupid. it really depends on if its paid off and mileage or do you like throw away money. i would go with number1. number 2 is not an option, buy newer tuck and most likely you will get a 10 speed which has its own problems. unless your willing to go withe 2.7 and 8 speed , it seems to be GM's most reliable power train for now. number 3 is a crapshoot, ford is no different than gm right now as they are having to also replace a lot of engines. so every manufacturer is having problems. if have money to throw away do what you want to do, if not stick with number 1