We bought a 2007 model City IDSI in white. 29000 original mileage. Never painted (a "kalam" had been done just above the grille though), for 10.75 a year ago. The owner was demanding 11.10 for it. It still costs round about the same.
As the car in question is painted and with 75000 on the odo, it shouldn't be for more than 9.5 to 9.75. No matter what people say, a car's value does decrease significantly following a re-paint. You can also check the "Used cars" section for a price reference. I think I saw an 07 city for just above 9 which looked pretty clean.