Buying car is not very easy if you have too many options. I had a budget from wagon R to chevrolet Cruze. It took me 6 months to finalize verna.
Strictly decide what you want, a new car or used car. Set the budget correct. Find out what you want Sedan or Muv. IMO
innova is a great car. It can tackle indian roads pretty easily and is very reliable too.
If you want a D segment diesel sedan that should tackle indian roads, then i guess you can look at toyota altis D-4d or Skoda laura. Though skoda's ASS
is not very good. But the car is great.
All cars have their own pluses and minus. It very difficult to find a perfect car and brand. So narrow down your decision to few cars and finalize among them.