If you want personal service, contact Kari Hess at Fletcher Chicago. They will support you before and after the sale. http://www.fletch.com
If I were you, I would go the rental route if you need an HD camera right now. Take your time and make the right decision. Remember what Jody said comparing his F-900 and the F-350.
Good luck.
Steve Eisen
Eisen Video Productions
Director-At-Large
Chicago Final Cut Pro Users Group