Women's all mtn twin

Taught my fiancé how to ski on Armada ARWs. She has come a long way over the past two seasons and now complains about how the ARWs don't handle very well in the crud and slush or when conditions are less than ideal. We are looking at getting her some fatter all mtn skis that she can rip harder on and feel more stable. We live in the Midwest but want a ski she could ride when we take a trip out west (unless it really dumped or something). I ride the ARVti and think its a great all mtn ripper and goes through crud and shitty snow great so shes thinking about the ARVw. She is almost 6ft tall and the 164cm ARW was great for her to learn on but now I feel she could go longer. The longest the ARVw comes is 168 which really isn't much difference. What do you guys think? Any other twins for women with around 100 waist and also a little on the longer side?