After their success last game (and let's face it, we really needed a big performance from one of the top 2 lines), I say we leave N-B-Z alone for now. Don't care if Zuuc and Brass score all the goals if that line can consistently knock out a goal or two a game ... sometimes more.
On Steps line, I think we need to give Kreids more time. He's having similar problems to Nash in that his power moves are not working and his plentiful shots on goal are at the logo, but his 2-way play has been adequate and he has been in on 5 goals. One big game from him in the next 2 games and his pace will surpass last year's. I want to try Oscar on 2nd line RW because of his solid 5v5 play this year, his nose for the net/accurate shot, and his responsible 2 way play. He is far from perfect, but Fast isn't going to help propel that line to success and Miller has been dopey on D (though I love what he is CAPABLE of on O). In the long run, Miller may be the man, but I don't feel he has earned the right to play on Line #2 right now. Seeing Oscar get the nod over him and Fast might light a fire under Miller.
For my 3rd line, Hayes played a bit with Fast last year, and they performed well. Miller and Hayes are solid playmakers. Good things could happen with that line. Not a line any opponent should overlook.
4th line is just the leftovers by default. Etem can sub in for anyone at any time on that 4h line. Staalberg, Moore, Etem would be a very quick 4th line when Stoll sits out.