Not sure I would go after Fuller, he is always injured and OBJ is often injured and wants the money. I would like either Landry, Humphries or Sanders in FA. Depending on what I would have to give up in a trade I wouldn't mind going after Lockett or Shenault. But we would still need to draft a WR pretty high, either 1st or 2nd round.
Who knows what guys are rising on NFL draft boards, but it looks like Jameson Williams, Chris Olave, Treylon Burks, George Pickens, Christian Watson, and Alec Pierce are going to fall in our 1st-2nd round range and be our best bets.