If you're in a position to win now I wouldn't be trading for Karlsson. It would be nice to have Karlsson no doubt but if you have a chance and judging by your team, you do go for it NOW. Also, if you were to keep Karlsson I'm assuming you wouldn't be keeping a goalie which would be a mistake IMO.

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12 team keeper H2H G,A,PPP, H, BS, +-, W, GAA, S%, SO

C: Crosby, Tavares, Sharpe (RW)
LW: E Kane, Moulson, Dupuis(RW)
RW: Callahan, Eberle, Voracek
D: Chara, Schenn, Girardi
G: Rask, Halak, Luongo

Start 2C, 2LW, 2RW, 4D, 2G
Keep 3 lose round player was picked in