There's a lot of good receivers in this draft, I hesitate to suggest drafting the best one there in the 2nd round.
D.J. Moore is my best so far. He's under 5'10" and it's impressive the way he fights to overcome his lack of size with physical running and catching. I'm just concerned he goes to the combine and runs slower than 4.50. He might not be the best complement.
Michael Gallup has been blowing up lately. Not truly elite in any one area, but does a lot of things well enough.
If you want speed, Christian Kirk is the guy. He was a slot receiver at Texas A&M though, so he's a projection to move outside.
Calvin Ridley is the consensus WR #1, but I'm not that big on him. I agree his skillset makes him perfect for our Z, but the 190 pound playing weight really shows up on tape.
I haven't finished Courtland Sutton or Deon Cain yet, but they've impressed so far.