I haven't followed this year's draft class nearly as much as last year, but something tells me that Schaefer or Martone are still the best solution long term. Positional long term solution that is, even though high end centers are veery hard to acquire outside of draft.
Martone could be stapled to Smith wing for life, because Celebrini can probably carry less productive players on his own by the time Martone is in the NHL line up. Schaefer doesn't need any introductions, he would help that defence by a country mile.
All in line 1st line: Eklund - Celebrini - Martone
Balanced:
Eklund - Celebrini - ?
? - Smith - Martone
or
? - Celebrini - Martone
Eklund - Smith - ?
even all in 2nd line could be crazy good:
? - Celebrini - ?
Eklund - Smith - Martone