After listening to the 11 podcast, I feel pretty certain that the Rams are not going to pick up any FA WR unless it is a very low level one. They're already paying 2 WRs big bucks.
Plus, with Jefferson in the fold, what the Rams need is a situational guy who is also STs. I suspect they'll go for some small school really fast kid with better KR/PR skills than receiving skills, but can take the top off of a defense with his speed.
I'm through guessing what round any position might be addressed because Snead is closed mouth about such things and it varies all over the map each year.