I voted for RNH in this case. I know that proven is almost always a plus, but I have seen what Kane can do and I think 90 is the max we will ever see from him. He has some of the best linemates and he still can't break in to 90 pts.
RNH on the other hand in his rookie year was over a PPG pace with Eberle and Hall both healthy. I would be taking the chance here because the worst case scenario RNH becomes a 75-80 pt player on his own.
***My best team in years and of all years...
10 team H2H 3 year max keeper league (6 keepers)
G A Pts PIMs +/- PPP W GAA SV% SO
C: Couture, Koivu, Boyes, Huberdeau
LW: D Sedin, Benn, Datsyuk, Moulson, Tanguay
RW: Giroux, Neal, St. Louis, Brouwer
D: Phaneuf, Edler, Green, Shattenkirk, Timonen
G: Quick, Backstrom, Bernier