Just got back from SDQ and rented an economy car. I was given a nissan platina, which is only manufactured for the latin market. Not a bad car, especially if you're only travelling with 4 people max. The backseat is a bit cramped if the driver has long legs and pushes the seat back. The AC kicks, and the car has a cd player.
On my previous trip I rented the compact and got the Nissan Sentra. Which has all the same amenities as the Platina, but bigger.
You can get a comprehensive view of both cars by going on the Nissan website.