I think that it's a no-brainer for Chia to go for Hamonic/Shattenkirk/Subban/Barrie/Larsson/any other D-man that is clearly a cut above the rest known to be available for trade/in FA. But, this is only the case if the price is right, or if any of these guys are realistically available for the Oilers. These types of players are turning into more of a less likely option, imo. I feel like Hall for Hamonic + is the only way we acquire Hamonic, Subban is a pipe-dream and I doubt Chia will overpay ridiculously, and it sounds like Shattenkirk probably wouldn't want to sign here (and he's only wanted if an extension can be reached). Thus, barring something just short of a miracle in which we acquire one of the upper echelon of D-men rumoured to be available, I think we are left with a combination of the remaining D-men:
Brodin
Dumba (I'd rather Spurgeon than either of the other Wild D-men, but I feel like he is definitely not as available as Brodin/Dumba)
Ellis
Demers
Hamhuis
Bogosian
Severson
Staal
Wisnewski
Wideman (I know, I know... Would rather him over Wis or Staal though...)
Fowler (seems unlikely due to the divisional aspect)
Campbell (seems unlikely due to rumours of wanting to go to Chicago, but would be a great vet on a 1-2 year deal to mentor our young D like he did in FLA, depending on the other defence acquired)
I've italicized options that haven't been mentioned in this thread yet. In all likelihood, I think we trade for one D-man, which determines the other we go after in FA (most likely Demers or Hamhuis). I'd hope one of the D-men from the trade would be Spurgeon, Ellis, or (if we get lucky) Hamonic/Shatty (more realistic than PK/Faulk/Barrie/etc at least). I'd prefer to stay away from Demers in FA because I feel like we may regret having him AND Sekera on a ~5.5 mil contract with a NMC for the next 5+ years, although (depending on who we get via trade) I would be more than happy to have him. But, depending on who the trade returns, Hamhuis/Campbell may work a lot better.
If the bigger names are in fact unrealistic targets, some combination of:
Spurgeon/Ellis/Fowler/Hamhuis/Demers/Campbell will be the best that we can hope for, with the possibility of acquiring a D-man such as Brodin/Dumba/Bogo/Wideman in a trade that would probably be met with scrutiny from some, depending on the return.
Edit:
I have a feeling Ellis would really thrive here if we could grab him from NSH, the price may be steep though.