This thread is stupid. everyone is different. Both height and weight, but also skill level, location, type of skiing, and even personal preference. Plus the size and flex of the ski is important. I'm 5'10", 170 lbs, and regularly ride 179s, two different 186s, 189s, and a 192. All are great skis, but used for such different types of skiing/snow.
There is no perfect ski size, sorry to burst your bubble.