Mammoth. If you haven't been.... you are missing out.
Breck may be wonderfully maintained and so forth.... but...
At Mammoth, you have 2 large parks with over 40ft jumps. Both of which have park chairs. 3 half pipes. an entire run entirely devoted to jibs and rails. The art park which makes for awesome photos. 2 stationary air bags. an intermediate park that is amazing for progression. and 2 small parks that are great for people just learning. All of these runs/parks have chairs.
And... they build a really great spring park that stays open till july that includes a fresh cut half pipe.
And... its pretty much always sunny and over 32 degrees so its never icy.