how much do you weigh? im the same height but i weigh close to 180 i would go with the 189. definitally not the 169 especially if you are riding pow. even if you are riding park they are way to short for you. at least 179
Why do you want something so fat if you ski so little powder? Something with an 80 to 85mm waist would be good. The new Public Enemy, AR5, STL, Chronic Wide, there's so many skis that would suit you better. And definitely go for something around 180cm.
I'm 5'10" and I got the 189 Seth Vicious. I also have a 179 Seth Pistol. if you using it mostly for park get the 179, if you actually want to ski some big mountain look into the 189. 6 feet is pretty tall, and a SV mounted +5 or so wouldn't be much for you too handle.
Does it annoy anybody that the first trick landed in Not Another Ski Movie WAS SEVEN AND A HALF FUCKING MINUTES INTO THE MOVIE???????????????? i paid for a ski movie... not a tour of a lightbulb factory