What do you plan to do? If you want performance all over the mountain and in pow, go longer, so 168, if you are just going to use this ski in the park go shorter, like 158 or so. Of course weight plays a little role in the situation to but Im to lazy to find out how many lbs 50 kgs is.
 'I would be embarrassed to constantly complain about my life considering all the freedom and opportunities we have today. People that can't find anything they enjoy in life simply aren't giving it a real try.' ~Nick 311