I currently own Voracek and I think he will have a big year. In saying that, I would still take 'angelo....

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10 team keeper league dress 4 LW, C, RW, 6 Def and 2 Goalies (gls and asts are a pt for fwds and 1.5 for Def, as is a +, but also -1 for a - forwards and -1 for "D", G - 2 pts for win, 5 for SO and pts for saves)
LW - Kovalchuk, Skinner, Boedker, Lupul, Vanek, Elias, Baertschi, Mcdonald
C - Tavares, Malkin, RNH, B.Schenn, Benn, Duchene
RW - Kessel, Purcell, Tarasenko, Voracek, Yakupov, Conacher, B.Connolly
D - Byfuglien, Kronwall, Yandle, Enstrom, Ekman-Larsson, Hedman, Green, Phaneuf, Souray
G - Kiprusoff, Lundqvist, Price, Bernier

Forgot to mention, I already own Karlsson, and am planning to protect him. Does this info change any of your views?

Nope. Having both Karlsson and Pietrangelo means you will be going into the season with the best D. You only play three D, and you have two of the absolute best.

Pietrangelo is elite at his position, Voracek is not. I imagine it's easier to find a similar forward to Voracek, than it is to find a D similar to Pietrangelo.