Go for Vitz or Cultus as both are good. VItz for its quality and Cultus for its easy/cheap maintenance and relatively bigger size = more comfortable + nice mileage.
Cuore is a complete NO (for me atleast). Its such a little car for this prize, that I consider it a total waste of money. Santro also belongs to the same category but a little less waste of money than Cuore plus they have bad resale values.