Replying to Recommend a ski for my dad

My dad tore his acl a few years back and last year was his first year back on skis.
the only problem is he has slalom skis that weigh in at like 100 pounds and I'm afraid of them hurting his acl furthermore..

So what we need is a light, all mountain ski that can handle east coast hardpack carving and will hold up in the bumps. He has been skiing his whole life so he is an above average skier.

Right now I am really into him getting prophet 90s but they are very expensive and im having a hard time selling him on a "twin tip" which he just sees as a freestyle "monkey park" ski.


So help me and my dad out so i can shred with him!!1!!!one!!!!