Good chance it won't be a difference maker, but I'd probably put Despres, Conacher, and Brunner in the minors. Palmieri is another option. I'm not sure that either of those two Fs will be lighting the world on fire this season (if we have one).
I'd err on keeping Vatanen and Barberio simply because those two teams have more opportunities on the blueline, and your blueliners aren't as strong. With your Cs being a strength, I'm not sure you'll utilize the dual-eligibility often.
In the end, I don't think you'll kick yourself with any of them.
Points-only, Full Keeper Dynasty League
Active roster (no starts, just total points): 12 FW, 6 D, 1 Goalie
Forwards: Ovechkin, D. Sedin, Stastny, Nash, Kesler, Ribeiro, B. Richards, Selanne, Hossa, Fleischmann, Whitney, Lecavalier, Alfredsson, Okposo, Plekanec, Doan, S. Kostitsyn
Defense: Goligoski, Campbell, Gonchar, Bergeron, Liles, McBain, Vatanen, Timonen, Visnovsky, Giordano, Wideman
Goal: Luongo, Holtby