I found a car posted on vroomindia.com and checked with them about the seller and other information regarding the vehicle. They were accurate, these people really helped me in valuation and other things.
Finally I was able to buy the car for a good price and after driving the car for 2 months I can say that yes one can trust on the online sale of the automobiles, provided the service provider is good. The other good thing about the website is they have mentioned cheap cars on their first page itself and one can look for cars which are below 1 Lac.
With other websites most of the things are paid, but with vroomindia.com as of now everything is available for free of cost. Even the valuation section is pretty good and the information is really nice.
Still they need to make couple of other changes in the website to make more user friendly. Really a cool website and good service.