I just recently did a slideshow on the top five 3-4 defenses of the decade so if you haven't read it yet, please do. Here
Selecting the top five 4-3 defenses was easier simply because there were more to go around. As a heads up, no team will be on this list more than once. So without further ado, here are your top five 4-3 defenses of the decade.
If you want to read my predictions on the Steelers 2010 season, here's the link.