You got plenty of options here---WR/WR, RB/RB, RB/WR---it just depend on who is there at your pick. Picks 1.7 and 2.2 put you pretty much at the turn, which is a good position to be in. Any combo of Fitz/AJ/Moss would serve you very well in a ppr league if you go WR/WR. Of the RBs your named, LT or Slaton would be the ones to target if you go with an RB first, both if you can get them. Good luck!
I like LT of the bunch if he's available, i think he will rebound after having a year of being hindered by turf toe. Calvin is a great guy to target in the second round I think he will end up being a top 2 receiver if not #1 when it's all said and done