I would definitely make a trade with Karlsson and Tavares being the principle pieces. Not only are you making your team stronger but you are weakening his. I would not include the OEL/Giroux. Maybe Perry instead of Giroux. Does he have any other Dmen available rather than OEL?
By the way, I like your 3-year rule.
G, A, PTS, PPP, PIM, +/-, Shots, W, GAA, SV%
C- Tavares, Getzlaf, Backstrom, Duchene, Ribiero,
RW- Gaborik, Perry, Downie, Nyquist, Burns
LW- Eriksson, Moulson, Huberdeau, Silfverberg, Johansson
D- Karlsson, Phaneuf, Enstrom, Gardiner, Voynov, Hedman, JJohnson, Ellis
G- Luongo, Dubnyk, Hiller, Pavelec, Fasth
Farm- Grigorenko, Nichushkin, Kucherov, Zucker, Trouba, Bjugstad, Teräväinen, Lack, Jaskin