The only worth wile skiers, are the ones twith twin tips. Keystone is a joke, it's nothing but a place for all the joeys to hang out. They are the only place in Colorado with night riding though.
Copper rocks my socks, good riding, and their terrain park is top 5 in north America. Winter Park is another exelent place, MJ and Parsenn will give you a wake up call, not to mention the tourist buckets.... yummy, they have their own Super Park, and it's one of the fastest growing destinations for Amature and Pro riders. Breck is nice but it is just another over priced crouded Gaper destination. Vail and Aspen are also nice Gaper desitinations. I would recoment A-Basin though, I am debating getting another season pass there, they usually have the earliest and lates riding of the year. I have a seaosn pass to Copper and WP though.