I dont agry with the telling of the price range before viewing the car...
people will think ur a tosser who will futher lowball the car if u agry to a lower price...
i usually just inspect the car, offer my low ball and they usually seem to accept, although my lowballs are only like -2k off the asking price.
i also tell people come inspect the car before you lowball so u dont futher lowball me when u come see it.