I'll let our board users answer your questions. Also take a look in the archives, you will find many posts relating to this topic.

From our experience, National seems to offer the best overall package, they may not be the cheapest, but they have the best reputation for car quality, reliability and service. At the end of the day, thats worth more than the few dollars you may save going somewhere else.

You can also ask your questions to "National" directly. Their General Manager is Sr. Elso Payamps. Email: nationalcar.dr@grupoambar.com