Personally, trading the pick (as part of a package) to for a true #1 D is what I'd like to see the most. Failing that, I'd opt for taking one of the centers. If Ekblad falls to them and they go that route, then I'm hoping we see two of our lefty D prospects moved to try to cover up the 1D/2C holes.
Sure, trading for a #1 D would be nice...I am just not convinced that kind of deal is out there.
Regardless, I would hope it is traded for an established player to fill a (high) need, and if not, take the best player left of Ekblad or Draisaitl (no way Reinhart is there).