The more I look at things, the more I think it's doubtful that any of the top three offensive linemen (Joeckel, Fisher or Warmack) will still be on the board when the Rams get to make their first pick.
One of the most recent mocks at Walter Football (one of the most comprehensive mock draft sites out there) has the Rams taking S Kenny Vaccaro (Texas) at #16 and LB Manti Te'o (Notre Dame) at #22. I think this is a very interesting possibility. If Te'o could make the switch to OLB, that would put stud tacklers into the two most vulnerable slots on the Rams defense. It would probably elevate them into the "premiere defense" category.
Here's the link to the article: http://walterfootball.com/draft2013