My nephew uses Enterprise and finds them good. Can't comment on their prices.
I think I've seen people mention that checking out the prices on Ryanair site might be worth a try.
One tip: when you get the car before leaving the rental premises take plenty of pictures on mobile or camera of both inside and outside of car in case of any accusation of damage having been caused to the car. Many moons ago a friend was accused of causing damage but got it sorted.