Thanks all for your suggestions.
I have never used AMD and don't have idea on that but I have little soft corner towards Sandybridge processors. The CPU will be mainly be for torrent downloading, and ya, also some little amount of gaming[want to play game demos that comes out with Digit DVD's]. This will mostly be used for watching HD movies and TV Shows and should work as my media hub, as through it I will broadcast videos to my PS3 and iPad.
As my plan was to get a Core i5 processor for 10k and a motherboard for 3k and 4GB RAM for 2k and rest 5k for graphics card.
Anyways, which motherboard should I pick of I go for a Sanybridge processor?
Should I get a PSU of 400W or above?