Other than Vatanen, the rest you list have no interest to me. Bogosian won't come here because it's too far from home (made a trade request from Winnipeg to go closer to home), Boychuk won't come cheap and he's signed to a ridiculous contract I wouldn't dare touch, Savard isn't that big of an upgrade, and Dumba is beyond awful (see IIHF Team Canada games to see what we are talking about him in our thread). Shattenkirk won't come here because his agent has said to Oilers media buffs he will play the UFA market and sign in the east (probably to Boston).
All those guys have been talked about thoroughly in our trade and rumor thread. Nothing new here.