at last after reading a few reviews about water coolers
i decided to go with air
as water cooling performence is just 2-3 c cooler
and as i don't have a 240mm radiator space in my cab
i bought a coolermaster hyper 212 evo
it performs well for me:D
CPU: AMD FX8150 at 4.6Ghz, Motherboard: Crosshair V Formula-Z, GPU: HD 7750 at 900Mhz, RAM: Corsair XMS3 8GB, Cooler: Cooler Master Hyper 212 evo, Cabinet: Cooler Master Elite 311 with 3 xtraflo fans, PSU: Cooler Master Thunder 500, HDD: Seagate Barracuda 1TB