A surprise could be coming Day 1. The Broncos will look to beef up their ground game this year after that dismal effort in the SB. I look for them to trade down into the the first third of Rd 2 and take Carlos Hyde with their first pick. Teams still looking for a QB (especially the Jags, maybe the Raiders, Vikings, or Titans?) will be trying to get in ahead of the Texans 2nd pick (#33) which will probably be a QB. Broncs should have an opportunity to get another pick, but even if they don't get any offers they could take him at #31. I doubt that anybody else they have ranked as a first rounder will still be there at that spot.
In the later rounds look for the Broncos to target Jarvis Landry or Jared Abbrederis - they're the type of savvy route runners that would mesh well with Peyton and provide good value in Rd 3 or 4.