We've just completed our holiday on the Gold Coast and we hired from Gold Coast Family Car Rentals.
We got a good rate (so much cheaper than the majors) including extra insurance (they don't charge a ridiculous per day amount for this either) and the other bonus is that if you need a booster/baby seat, one is provided at no extra charge. The majors don't do that!
We ended up hiring a 2001/2 Mitsubishi Magna for 7 days. It had well over 300,000 km on the clock, but considering it's age it drove quite well. Remarkably fuel efficient too. And it was given to us very clean and very straight.
Grant and the crew are all very nice and helpful and offered any assistance we might have wanted. We were picked up from the Gold Coast airport, and it is a 20 minute or so ride back to there office in their minibus. All our luggage was moved from the bus to the car whilst we finalised the paperwork.
Great value for money and would definately use them again.