@kitchener, I would read the whole thread. I'd also use the search function.
Hard to go wrong anywhere, and I'm offering a different opinion. If you do stay at the base of Ajax, it will be significantly more expensive than staying out at Snowmass. Either way, I'd start with Airbnb, VRBO, etc. You can find some deals. But get on it NOW.
Have fun.
Good advice -- I'm not too hung up on the where-to-ski part -- we'll sample then return to whatever cream rises to our surface (with a nod toward conditions), but I appreciate your arguments for staying downtown. I might start grading on a curve toward that direction. You mentioned "Old Snowmass" -- is that the village (not the base)?