The Peloton and the Circuit seemed to take turns from year to year as the top model sold as a complete bike(The Paramount and Prologue were sold as framesets only). I think there may have been one year where they were both offered though, and I don't remember which one outranked the other.

The hierarchy changed a bit from year to year with models appearing and disappearing.
The best way to see it is to browse through the catalogs on Tom Findleys website.

http://www.trfindley.com/pg_schwinn_cats.htm