Obviously it depends on what we do in the 2nd. If we go JuJu, Zay, or even Kupp in the second I think you need to look WR and maybe RT or S in the third. I don't think there's great value at LB in the 3rd, so I'd be in favor of grabbing Cunningham (provided hes' available) in the 2nd, and hoping one of the aforementioned WR's are available (or even Samuels, Westbrook or Godwin).
The nice thing about this draft is, we should be able to get 3 contributors at LB, WR, RT, S, or LB in rounds 2 & 3.