Car Hire advice - Pisa Airport

[London GT3]

I am flying to Pisa on Fri 6th Sep and staying for 5 nights. I have always booked my car via Holiday Autos and have had every range of service. I always book a 4 or 5 seater and select a mid size saloon. The best I ever had was a brand new high spec C Class with only 7 km on the clock. At the other extreme I have been presented with a very old and tatty Renault Scenic with stellar mileage.

Can anyone recommend a car hire firm at Pisa that I can deal with before I go? Alternatively, am I better off turning up at the airport and visiting the different desks, bearing in mind that Hertz etc will have huge queues.

Thanks