Of the skis you are looking at, I think the Wayback is the most versatile. The Stelvio's are cool but lack the tech benefits of the Wayback and the Evo's are even more tricky to ski in crud and less than ideal snow. The only ski I'd want to use in a resort setting of those three is the wayback, but if you're splitting time evenly you might even consider something a bit heftier.

I live in Vancouver and ski the coast range A LOT. I do a lot of touring so my skis are a little lighter and thiner than most out there. I have an older pair of Stelvio's (2006 version) and a newer pair of K2 Wayback's (2012 version) . The Stelvio's are great on spring corn snow and at the resort, but they take some skill to ski in deep heavy snow. The K2 Waybacks are a lot more forgiving in deep snow and variable conditions. The Wayback's are great beginner skis and very versatile. They're ok in powder, ok in crud, ok on ice, ok on steeps, ok for long tours. They are a little on the skinny side with only 88mm underfoot, but I'm used to skinnier skis. If you want a midfat ski I would look at the K2 Coombacks.