Mandeep, looking at your description, you don't need 4WD, you can do fine with 2WD. To understand 4WD read this link:
Howstuffworks "How Four-Wheel Drive Works"
I am currently in the market for 4WD which I intend to take off-roading. So I have checked the market.
Bolero Invader is not available anymore. Now it is called SLX 4WD, it comes with leaf springs in the front and rear, so expect real bumpy ride. By default the 4WD version comes with a weaker engine, however I am told you can order it with the DI engine. Also, the test drive is not available since it is made to order.