If you can get the chance to demo, go demo. I tried out numerous of the skis on your list last season while I was looking for a powder ski a little wider then my Johny 94's. I'm 5'5" about 140, female, was teaching at Castle mountain and had lots of powder to play in last year.
I ended up not particularily liking any of the skis that were highly recommended (they were fine, just not as fun as what I was on) accept for one, and that was the K2 Kung Fuja which I loved, but in the end, decided not to buy as it was to close to what I was already skiing, a park powder twin tip, though the K2 was, imo, more fun, and faster with a lighter touch and landing then my jonny which I also like..
I found the salomon csar and S7 stiff and un responsive, it surfed in powder but to me felt like wood under my feet. I took the Gottama cat skiing for a day, again, wasn't overly impressed. To keep it really short, I could go over the characteristics and what I thought was good and bad on each ski but the important thing is, it was entirely different then what people who skied with me thought I'd think of them and then what other people thought of them. Just because I Iove the K2 Kungfujas, doesn't mean you'll like them at all.
Read about each ski, think about how you ski and what skis according to reviews seem to excel with your ski style. Narrow it down and try out a few. If none of them work, try something you weren't expecting. I did, btw, at my weight, find I had lots of float with my 94's in powder, not to say I won't get more with a wider ski, I just didn't find a wider ski in those I tried that made me go wow, gotta have it.