I am planing to buy a Full HD LED TV, but I am totally confused in Contrast ratio (please go through the given link)

kanewolf is correct. Especially about contrast ratio. As there is no standard measurement for it most manufacturers just make up a number to look good.
The Vu TV in particular doesn't tell you how many HDMI Inputs it has. The aspect ration spec is wrong too.
The Micromax has a free additional two year warranty.
If you can find someone that has tried to calibrate the sets how well they were able to be fine tuned for better picture would help you choose.