Im at Okemo right now. i skied it the first two days i was here (24th-31st) and i was unimpressed. Their big park has like 5 features and its the length of the entire mountain. the other three, including the kids park, weren't even made yet. Two days ago i went to stratton, had a ton of fun even in the slush. Today im going to Killington, i'll let you know how it is, but im pretty sure it will be good. Their a huge mountain, lots of people so they definitely gotta have their parks up and maintained.
As for the stash, thats opening in January right? that sucks cuz im missing it. But i spent two weeks in New Zealand this summer and skied the stash at the Remarkables, its mad fun, and that was back when it was only 1 of 3, not 1 of 5, so it was like even specialer, ya know? haha