What sort of stuff do you like, park, steeps, powder?
Northstar for the park. Not my thing, but they're pretty well-known for the quality of their features.
Kirkwood for freeriding and powder and the crazy steep stuff, my personal favorite place in the region.
Not a fan of Squaw, but it has nothing to do with the terrain, which is amazing. I'd add to that the terrain at Sugar Bowl and Alpine.
Heavenly is great for trees (so is North*), and also the views of the lake, which are quite stunning. Probably the only place where you can ski from one state to another.
Homewood is a nice secret. I took my first lesson there.