I have 4 WRs worthy of a 1st round pick: Moss, Fitz, Johnson & Johnson. (Not Chad)
Depending on the scoring system and number of teams, I also consider Brees and Brady to be worth 1st round picks.
At RB, I think Peterson and MJD are the top two, but after that, I'd go WR. Then I'd mix in LT and the QBs.
That's 9 players If you've got 12 teams, that leaves 3 more RBs for the first round. Westbrook, Slaton, Turner, Forte, DeAngelo - depends on who you like.