You have a great quiver suggestion there! 2 skis should be enough for anyone but the most diehard gearhead (which would descibe many of us hanging out here on the forum!). If I could have two skis, they would be
1) Mid-radius top end carver for hard snow and variable condition days. Something stable and energetic. Examples: iXRC 1200/1400, Supershape, Contact 11, Mach 3/Power, Speedwave, RIPstick, RX8 ect. These skis will rip up any frontside condition and be very versatile, as well as stable while up on edge, not to mention full of energy. They can be great 1-ski quiver models for skiers East of the Mississippi.
2) Versatile wider ski for crud and new snow days. 85-95mm underfoot. Examples: iM88, Mantra, 777/888, Snoop Daddy, Legend 8800/Mythic Rider.
I also have a 3rd ski to compliment the quiver (yep, I am a gear head) and that is a full race stock GS with soft plate (in my case, Elan GSX 182cm). This is a useful ski for hitting 45mph+ on spring early-morning, midweek days when all of 10 people are on the hill. Obviously, not a lot of people are going to need a ski a full GS race ski, especially if they ski in crowded conditions or on a small hill. I am also not a big fan of super-wide 100mm plus skis, as I feel that I am just skimming across a groomer, whereas on 85mm skis, I am in the snow (not buried) but still getting the feeling of powder skiing, up and down, floating non-gravity movements. Maybe if I was to take a heli-skiing trip to Alaska I might feel differently, but for typical PNW conditions, 85-90mm is about as wide as I want to ski.
As always, YMMV.