Here's a look at the top 5 players at each position as free agency gets underway ...
Top Five Defensive Tackles
The best defensive player in the NFL. Dominates the line of scrimmage and makes everyone around him better. There are a couple of possible concerns. Has only played like an elite player in contract seasons. Also has some character issues that could stop some teams from giving him a monster deal.
Athletic defensive tackle who can get to the quarterback. Has 19.5 sacks over the last four years.
Everywhere he goes the 3-4 comes to town and drives him away. Robertson is a 1-gap player and not a run-stuffing nose tackle.
Underrated player who just gets the job done. Lacks ideal size and athletic ability, but Thornton has been a quality starter for a decade.
Haye had a breakout season in 2007 and looked to be a player on the rise. His tackles fell by more than half. He didn't register a sack. He's still only 26 and has shown the ability to be a playmaker.