We are trying to rent a car for 7 days. We will be travelling from Santiago to Valparaiso and then south to Colchagua wine Country. I find that by using Hertz or Avis in the US the price is very high. Has anyone used local companies like United Rent-A-Car Chile or citycarrental.com. How do I make sure I have all the proper coverage? How do I avoid hidden fees for insurance and taxes? What should I expect to pay for a mid-sized automatic? Has anyone had experiences with any local companies?