I explored all the rental possibilities before I left Canada. Most car rental companies give you an price that does not include the mandatory extras such as collision damage waiver, personal liability, and theft. These extras can add up to more than the price of the basic rental. Also, a lot of rental companies in Europe do not accept the Gold Card Collision damage waiver inherent in the card.
I ended up getting a car from a compay called carjet.com. This is a web only based company specializing in Spain and Portugal. One of their companies called All-Inclusive-Car-Hire.com rents cars where the rental price includes all the liabilities.
I rented a car for 18 days at a total cost of 300 Euros. The car comes with a gas tank almost empty and when you return it they expect it will be almost empty. The company representative will meet you at your destination with the car any time of the day or night. The car can be returned any time of day or night. When returning, there are no papers to sign, nothing. You pay up front for the total cost of the rental.
I had no problems whatsoever with the company or the rental car.