We have a leased Chevy Venture and are looking for a new minivan when our lease is up in November.  I liked the Venture except it has a dog of an engine and my husband wants one with a navigation system and dynamic cruise control.  I have done some research online and so far the only minivan that has the navigation system, dynamic cruise and optional 8 passenger seating is the Toyota Sienna.  Does anyone out there own a Sienna?  If so, how do you like it?  If not, do...