Replying to How tall do you like your skis?

ok so i see these threads of people gettin parks skis in 170's and there 6 feet tall, anf then there are people who are 5' 3" and there getting skis in the 170's 

so my question is what is the SUGGESTED  height at getting skis for people, like ive herd nose or eyebrows 
 
whart are the advanteges for having longer or shorter skis?

now my personal preferenace is letting the ski round over my head for park and have a few inches above my head for allmountain/powder is that resonable? or am i crazy? i know its all preferance but serriosly what do you like and what are suggested considering that youl probably be riding center on most skis?

tanks for da help mon