@Nilakantan Erode I would agree with everything @Stumpy Paj has said. If you look past his poor sentence structure there is solid advice there.
Late last year I was in exactly the same situation and built excel spreadsheet comparing power to weight ratios, test drove lots of cars and got my list down to two cars:
* Y61 Patrol Short Wheel Base
* Toyota FJ Cruiser
The reason I picked these two is that I wanted something that had a short/medium wheel base which made cresting and navigating tight dunes easier, great power to weight ratios which helps you in those tight spots and last of all reliability.
I ended up buying the Y61 because a great car became available but would be equally as happy with the FJ.