I used enterprise as well after checking around and found tehm teh best value. Used it to move house and it wa great . Get an extra high one as the difference in what you can get in is unbelievable.
I used Prestige in Palmerstown a few years ago and found them to be much cheaper than anyone else and they provide a good service. I used my own car insurance to cover the rental period. Worked out about €65 per day.