The longest amount of time without power in WNY came from a snowstorm, rather than an ice storm. I had no power for 2 weeks in Oct 2006 in Cheektowaga, some longer than that.
Taking the blend of models into account I feel like we're all in a pretty good spot. I'd still stick with GFS/EURO compromise. Wouldn't worry about the high res models until tomorrow night/Weds.