CaitJenks wrote an answer about Rossignol S7 Ski on April 6, 2013
It sounds like you will want to do mainly off-piste skiing, and for that I think the S7s will suit you well. I have S7s, they are my only pair of skis, and I adore them. I ski Telluride, Powderhorn, Alta, and Crested Butte and I wouldn't trade them for anything. In the 168cm length the S7's dimensions are as follows: 136/105/114. In the 178s they are 140/110/118. Even mounted forwards, you will find the 178s to be quite a lot of ski. Probably too much. My guess is that you would be fine on the 168s. You may need to "grow into them" a little, but based on how quickly you're learning, I think you'd find them a fun, stable ride, especially if you already like the Rossignol "flavor", so to speak.
As far as bindings go, get whatever you want. Your height and weight would not have you reaching the upper DIN settings that would require super burly bindings. With boots, it depends on how aggressively you want to ski, but most importantly get something that is VERY snug, but not painful. You will need to sit down and try on half a dozen pairs at least. This is where an experienced boot retailer comes in handy. A good retailer will also be able to adjust the cuff alignment for you, and that's really important. Boots are the place where spending too much and getting something that fits, is comfortable, and works for you is better than trying to save and getting something that doesn't fit and hurts. You'll end up spending even more money later.