I think that merely demoing skis without getting a bit of modern technique might be a mistake. If you want to buy equipment, first get your boots straight, then take lessons when you have a good stance. Finaly, when you know how to use a modern ski and your stance is balanced and aligned, then go for a ski that will let you advance in technique. In my opinion, in the east, that means something with a waist about 68-72 mm, a radius of about 13-18 meters, and relatively little taper. Taper is how much straighter the back of the ski is than the front. If you have taper the turn radius of the back ot the ski will be greater than the fron, and you will not get the feel of a solid hookup in turns. Taper lets a skier have an easier time releasing, and also is very kind to the skier as the snow gets deeper. A ski with little taper is challenging to ski in deeper snow, as it can nosedive a little more easily. In the east, very deep snow is a rare challenge.
At your weight, the ski does not have to have a very stiff flex. I tend to ski stiffer skis, but I weigh much, much, more than you do. I think you would be happy with most major brand skis if you look for a ski with a length about 160, a waist around 70, a radius around 16 meters, and relatively little taper. Typically to get the right flex for someone around your weight look for the second ski from the top of the carver range. Stay away from skis that are designated as race skis, as they likely will be too stiff for you.