i'll get this out of the way:
damn dude youre skinny as fuck!
okay now that that's been said for the first and last time, here's my thoughts on sizing: skis should be as tall as you, give or take a handful of CMs based on your weight/skill/preference
basically what im saying is, unless youre weak as hell or arent very good, you should have a ski that's as tall as you. and if you charge and/or prefer more stability etc and can handle it, go a few CMs bigger than you