I would dump all 3. Helm is a good player, but he is not going to age well, and he is never going to be a legit top 9 player. He simply doesn't have hands, at best he has one Draper esque year. Richards is done, and wasn't needed this year. Miller is good depth and a solid PKer, but we have younger cheaper guys that can take the roll.
Abby-Larkin-Z (I'd like to see Larks transition to center if possible)
Mantha-Dats-Tatar (Give Mantha a real playmaker to play with, and see what he does)
Nyquist-AA-Sheahan (I'm fine with Sheahan and AA splitting center duties, need to see if one of them looks like he could be a legit 2nd line center, hope Nyquist rebounds)
Cally-Glenny-Jurco (Cally and Glenny give us a good agitating presence, and Jurco adds some skill and hopefully has a fully healed back)
I'm also very pro dealing one of Sheahan, Tats, Nyquist, and or Jurco for a defensive upgrade. Pulu should be deal period, as I simply don't see a spot for him, even if Nyquist or Tats are dealt. We can always sign a 4th liner and bring in a bit more grit. I think our 4th line has lost its identity since Abby/Helm are no longer on it.
Larks, Sheahan, Jurco, AA, Abby, Glenny, Cally would provide solid PK options.
Plenty of forward units for the PP.
Defense is more of a mess.
DD-Green
Kronwall-Trade
Ericsson-Marchenko
Oulette
We probably lose one of Jensen, Frk, Sproul to waivers, but I don't think any of them have a future with the Wings.
Howard has to be dealt somehow. The longer he sits as a backup the worse he is going to look on that contract. Honestly throwing him in net for the rest of the season, and hoping he looks like a starter, would probably be our best bet long term.