Wow. Why have you not dropped Pelf sooner? Yeesh.
Anyway, I would NOT add Hunter or Wood.
WayRod, Cahill, Bumgarner, and Dickey are all on the same level with differing levels of potential. I would say WayRod's ceiling is highest because he has the best tools out of anyone (except for maybe Bumgarner), but I'd say the basement is highest for Dickey or Cahill (as in, they are the least risky/least likely to completely kill your team's ERA/WHIP for a week).
If you're a risk-taker, you'll go with WayRod or perhaps Bumgarner.
If you want to play it safe I'd say Dickey. Maybe Cahill if you wanted.