I'd say depends on your size and age. If your gonna grow a lot next couple of years maybe get something cheaper cause your going to grow out of it.
If you dont think your gonna grow anymore consider a better ski. It will last longer.
If you have a pair of skis that work and are a decent fit, wait till your hill or someone nearby does a demo days. Then test all the skis you want and see what feels best.
No one here knows what feels best for you than you.
Oh a ski for advancing park rider that wants a little stiffer ride. Armada El Rey. Not sure what size to recommend since you didn't give your H and W. A lot like the AR7 but cheaper and full cap. Has full traditonal camber though. This would be a great park ski that can rip everywhere but a tad stiffer than AR7.
171 is 121-85-111 and will ride switch fine.
O2 gearshop still has El reys for $280.00. Thats crazy cheap. Usually $400
http://www.o2gearshop.com/catalog/product_info.php?cPath=1_567_568_569_572&products_id=41311