Hamilton's value is likely all-time high.
This package doesn't sniff him, even though I love Gallagher and Beaulieu I think is a player on the rise; Dougie Hamilton is easily the best piece here (he has more points than the two forwards combined). His possession numbers are also excellent, out of every Dman across the league with more than 750 minutes played his possession numbers are only behind:
Krug
PK
Doughty
Also, he starts 4-7% less of the time in the offensive zone than these three, and only PK starts in the D zone more than him (by 0.5%).
If a team wants Hamilton from Calgary, Dougie that is, they better be ready to pony up a major haul.
Galchenyuk and Mikhail Sergachev would be a good place to start.