What are the best defensive back groups in college football?

Florida State's Derwin James could be a top pick in next year's NFL draft. Don Juan Moore/Getty Images

Editor's note: This article was adapted from Phil Steele's college football preview magazine, which is available here.

What's the best defensive back unit in college football? Start with Florida State, led by a healthy Derwin James. But don't count out Alabama, which has a typically deep and talented group.

Here's a look at the top defensive back programs for this season.