Fasth is the perfect sell high goalie right now. Goalies dont come cheap on a good day so if you are looking for Fasth, you best be prepared to over-pay for him. Is Duchene an overpayment? For a good goalie, probably not. The problem is, we don't know how good Fasth will be. As you said yourself in your title, he's the flavor of the week and everyone is liking what they are tasting.
If you want Fasth, prepare to pay Duchene for him but I would offer Fleischmann for him and hope he will bite. I wouldnt want to pay Duchene for him, especially if Fasth all of a sudden falls from grace.
10 Team, Points Only, Cash League
25 Man Roster (no position), top 20 point getters count at end of month
Keep 20/25 at seasons end, Cut 5 to FA for redrafting
Goalie points W=2pt L=-1pt SHO=2pt
Stamkos, Tavares, Hall, Couture, Wheeler, Filpulla, Eriksson, Hodgson, Turris, Steen, Letang, DRoy, Yakupov, Byfuglien, Baertschi, Zuccarello, Silfverberg, Boedker, JSchwartz, Killorn, Bonino, BNelson
G-Rask, Halak, Schneider