Buy a new car, or get a used car?

I need a personal finance check. My current vehicle (2009 Ford Ranger) has been sitting for a month because the body is cracked and it's unsafe to drive. I'm mulling over getting a new all wheel drive SUV like a Honda HR-V or a used car, like an Acura TSX, Accord, or a Corolla. I'm interested in an all wheel drive because I go back and forth to my home town in the mountains, where the commute in is a dirt road over a mountain pass. I have enough cash to put a sizeable down payment on the car (15-20k). I'm enamoured with the peace of mind factor of a new car, however, I have the money just to purchase a used 15 year old car outright. What makes the most financial sense in my situation?