Does your league require 2 starting QBs??? I am pretty surprised that AP didn't go til 5
even if that is the case.
What are your starting requirements?
I will say this... take the best available RB or WR. There was a run on QBs early, that means you can load up on the top RBs and WRs.
I wouldn't even think about drafting an IDP until all my skill positions (and most of my backups) have been drafted.