In an ideal world, we'd all be able to buy new cars all the time. And they would all be mid-engined and Italian. However, this is certainly not an ideal world, so used cars are the way to go for most of us, most of the time.
Buying a used car is full of pitfalls, and they're mostly in front of the buyer; the seller has the advantage of already knowing all about the car. While there's no foolproof way to know whether a used car is a good buy or not, most of the crap can be filtered out if the buyer takes the right steps.
Here's how to take those steps.
The Complex Guide To Buying A Used Car.