It helps to know yourself and your family pretty well before you wander into the Chevrolet store to look at minivans. There's a Chevy Venture designed for every imaginable type of family and the number of models can be confusing. They are based on what type of seating arrangements you want and how flexible you need those arrangements to be. Chevrolet claims 200 different seating set-ups are possible in the Venture by removing and adding seats in different places.New for 2000 is a model offering the videotape and video game players and built-in headphone controls that have been popular for the past two years on the