I worked at Six Flags over Mid-America aka. SFStL from 1991-1993 and 1995-1996. I worked in entertainment and was a manager for three of the five years.
Disaster Transport
La Vibora
Avalanche - KD
Alpine Bobsled - GE
I like Disaster Transport the best. There is an added fun factor with it being in the dark.
I have found Cleveland to be cheaper to fly into using Southwest. You have to go to Southwest to book through them. They do not book through yahoo, travelocity, hotwire, etc.