Unless you're paying cash, it's cheaper to buy new than used right now.
Ford, Dodge, and Chevy are all offering 60 months 0% financing, and I think they are all 5/100 powertrain warranty.
Its kind of like the oil debate, everyone has an opinion, and everyone has a friend thats stuff blew up.
I have a 1997 Chevy, a 2000 Dodge, and a 2004 Ford, and have had minimal problems with any of them, nothing drivetrain related...though I know people who have had problems with all three makes.