Many service providers across UAE offers a wide variety of cars from basic models to luxurious vehicles. www.8keyz.com is one of the online car rental agency in UAE offering car rental and sales services in and around UAE.
If you are looking for car rentals in Dubai i recommend http://www.proxcars.com (Prox car rental company in Dubai). I had a great experience with this rental company. i collected car from this company previous year for international conference on nano technology which is held in there.
You can also go in for Hertz. They are a well established name in the car rental industry worldwide. Have great services in the UAE as well. You can check their rates and models on their website- https://www.hertz.ae/rentacar/reservation/
It is very difficult to find right car renting company in Dubai since there are plenty of companies offering various offering including cheap service and low quality . Anyway you can check all kind of available vehicles for your comfort. http://www.carsonline.org/nissan-patrol-makes-world-record-pulling-170-tons-cargo-plane/