Snowbird. But I came to the decision to get one by a circuitous route.
I bought the Ikon Pass a couple of weeks ago to include my Mammoth (4-6) and Winter Park (12-14) days next year. My 16-18 Snowbird days presented a bit of a quandry: My first reading of the Ikon FAQ led me to believe that after the included 7 days the additional 10 days or so would be at 25% off. However, a closer reading showed that additional days are at full price. I'd gotten used to the MCP half price days, and I never previously thought much about a Snowbird season pass. Until I looked it up and realized that the senior pass is only $659 ($999. non-senior). Up to then, I had thought the solution was to buy the 10 day card for $559 (last year's price). However, with 4 days coming up next week being included, buying the season pass on top of the Ikon pass became a no-brainer. I really hate the idea of the Ikon days going to waste, but after rolling it around in my head a bit more, I realized that I can use the 7 Ikon days to cross over to Alta if the need rises to meet someone over there, which always seems to crop up during a week's stay.
Oh, and next year my 6 Ikon days at Jackson Hole will be gravy. And then there's Deer Valley... And Solitude...