Tulsa Ballet has some amazing dancers, and the troupe rivals what you'd see in any other big city.
Their season is split between classic ballets (Sleeping Beauty, Swan Lake, etc), and more modern ones. Unless you like all types of dance, I wouldn't recomend the season tickets... usually people like the classic ballets, and find the other ones rather odd.
One thing I miss is "The Nutcracker"... they changed it! I wish they'd bring back the old version of The Nutcracker.