In 6-8 Lakh Rs range you will find all-most all the premium hachbacks..
Vista is truely VMF car but I am still afraid of TASS.
If City driving & Mileage is of your priority & (of course) Nissan delearship in available in Kolkata, you can consider this as a strong option. TD it to believe its performance.
Other than that, I believe Punto, i20, Swift can also be considered