Don't buy the Ikon as it is has been around since 2001 and may be phased out in a couple of years. Besides, to my knowledge Ford is nowadays selling only the 1.3 Litre Flair petrol model. The diesel engine becomes quite noisy once it gets old. If you want to buy a diesel sedan go for the 1.3 Litre Multijet engine developed by Fiat, which does duty in the Swift Dzire and the Fiat Linea. But both cars may exceed your budget of Rs. 6 lakhs. If a hatchback would do, buy Swift Diesel or Fiat Grande Punto Diesel.