thanks for ur replies guys .... but it was too late ...... now i have done the research on net and decided to go for zalman cnps 9500 led one ..
asus star ice is good too but is very noisy and is very heavy ..
as for cooler master , the vortex tx and vortex dream are good but they are without heatpipe designs .. for 2 k and 2.3 k respectively .. and hper 48 and hyper 6 are heat pipe ones for 3 k and 3.5 k respectively .....'
but after a lot of net surfing , the zalman one looks very good

.. only 512 grams and looks cool with the blue led fitted in the fan .. only problem is not available in india ...