Personally i wouldnt trust sunchase!,,we had nothing but problems with them
Arrived to collect the car to be told there wasnt one, tried to sell us an upgrade(usual thing), then told to go to another place to pick up the car. As a gesture we were told not to return the car with a full tank of petrol for our troubles,even though we had this written on the actual invoice ,they still invoiced our CC for alot of money, which took nearly six months to get back(and a rather large phone bill).
IMHO this is not the sort of thing you want to be doing on your first day of your holiday spending hours running around trying to sort a car.
Have you tried autosabroad?.
jules