I'm your height and a solid intermediate skier. I'm perefectly comfortable on 175-179's. Kinda in the same boat as you but thinking about sizing up for some powder skis.
Everyone will chime in with a shorter height and longer ski comparison. Point is, demo some longer length skis if you can to see what your comfortable with.
Different strokes for different folks.
I more than likely made a grammar/spelling mistake in that post. ↑