Now for some credible information... I used to sell skis at a shop in my town, we sold a ton of armada, met with reps to discuss products ect.
Your pretty light, so a softer flex would most likely be easier for you, depending on your ability. How long have you been skiing for, what would you classify yourself as (beg-expert), what do you like to ski out of park? For sizing 166 or 171, I'm honestly terrible at size recommendation when I can't compare the ski to your body.
As for specific skis.
T-Halls: Soft flex in the tips and tails, medium underfoot for edge grip on hardpack. Their buttery, nice swing weight, durable like all armada's, ar50 sidewall (half cap half sidewall) to decrease weight. Their great for park, more rails small jumps, than huge kickers and pipe, but at your size, you might prefer a softer flex. It will be more forgiving, again depends on your ability and the tricks your throwing.
Ar7's: Stiffer flex, not stiff by any means, compared to a carving/race ski their noodles. Their medium in the tip and tails, stiffer underfoot. Their still just as light at the t-halls same great swing weight, ar50 sidewall. They are more directed to bigger jumps, rails, a bit of pipe, all-mountian, basically what your looking for.
Pipe-cleaners are ment for pipe, groomers, jumps, their bases are not as strong as the other two skis so they will get damaged easier on rails. They have a race-base so their super fast if you keep em waxed, but they dry out faster. The other two skis have regular bases so you can go longer between waxes and they will keep their strength. Great skis, not sure if these are what you are looking for.
T-halls and ar7's are very similar, I believe they have the same dimensions at each size. It honestly depends on your ability. Someone who is 6'2 200 is going to find these skis very different from you.
So basically how strong a skier are you? Do you think you want a soft or stiff ski. Thats basically it.