Best noise cancelling headphones under 2k?

Hey guys...i need suggestions for good headphones with the best possible noise cancellation under rs 2000. Since all this while I have just been using cheap headphones..i dont really understand which one to buy. I saw a few of sanhiserr and maxell headphones at a local shop here. Some had active noise cancellation while others had just passive. Which would be better? My main usage is, since my computer is in the living room,i m forced to hear the saas bahu non-sense on tv all day. I just can't concentrate and I get the urge to pelt stones at the tv. So I want the headphones to be able to block most of the noise.

Thanx
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