Here are my thoughts on a 3 ski quiver: (I want versatility from each ski, and top of its class performance) (My slant: East Coast, expert, Clyde, race coach)
Hard snow ski: I put the Laser AX here due to is versatility and high level carving performance. Plenty of other skis would work here.
All mtn ski: This one is tough, so many choices and flavors. I like my Liberty Origin 96 here. Can handle all conditions and great in trees. Bonafide or Brahama or Enforcer or Stormrider or MX 89 ect....) Width should be adjusted for East vs West Coast
Powder/soft snow ski: Another ringer here, Moment Wildcat (used to be called Bibby Pro). I have never skied a more versatile wide ski in my life. I couldn't believe how good this ski is on everything (well, maybe not ice) Its 116mm wide, but doesn't ski like it. Its actually my son's ski, and its all he uses on the East Coast. That's a bit extreme for most people, but the ski is that versatile. I personally own a 143mm wide Ski Logik Depth Hoar cause I want float, and lots of it. A 125mm ski does not give me the float I want, big guy thing. Plenty of other choices depending on how much float you want.
On the East Coast I don't get much use out of my powder ski admittedly. But owning the ski has motivated me to take a vacation day pre-storm, and catch some deep days. Honestly, if I didn't own the ski, I wouldn't put the effort into getting up North chasing storms. Something in the 108 to 115 mm would get more use.