Try to check out the new Passat as well whenever the TD car is available. If you can stretch your budget for a Passat or Superb , settle for something between the two after a thorough. I have never driven both the cars but based on reviews both goes neck and neck when it comes to performance , Passat edges out Superb with new features , but Superb edges out Passat when it comes to Interiors and comfort. The Passat is also slightly more FE thanks to the Bluemotion technology. There are no other options available in this segment with a diesel heart , so out goes Accord and Camry.
If you are willing to settle within 20Lakhs wait for the new Jetta. As i said before its coming with an all new engine and also has DSG box in diesel. Next best option is the Laura , a true driver's car!
Check out the Cruze too , complete VFM car though a bit cramped on the inside one hell of a performer and a pretty good handler too.
If you don't care about the brand value then check out the Sonata Transform too.
Willing to give a chance for Renault Fluence too?