I agree that a FA WR at this point is unlikely. And I've been saying for some time that these are the best players available in this draft: Winston, Cooper, Beasley, Gurley, Duke Johnson, Cam Erving, and Green-Beckham as the wildcard.
A lot of those guys aren't going til the bottom of round 1 or top of round 2 though. So with that said here is my most likely picks:
Tier 1 (greatest chance): Mariota (since Winston is off the board), Cooper, Beasley.
Tier 2: Ray, Gregory, White
Tier 3: Waynes, Dupree, Fowler (I don't think the 260+ LB's are a great fit for our needs so they are at tier 3)
Round 2- this is where you could see Green-Beckham, Gurley, Erving, or Johnson. Great value there.