it wouldn't be that bad unless youre throwin 9's or more.
id say get the larger ski if your gonna have them for a while and ski anything outside the park but if youre gonna have the skis for no more than 2 years and are planning on spending 95+ % of youre time in the park get the 171's. i ski 174 rossi scratch fs skis and am as tall as you but 15 lbs heavier. the skis are perfect and will not be too small in a year or two.
Pabst Blue Ribbon MMM MMM GOOD
I could use one right about now