thanks for the responses
What PSU do you have?
520 watt codegen
and for the price ,300$ is about 1100 IS (Israeli shekel) . i think that the prices here is much higher than yours
for this http://www.newegg.com/Product/Product.aspx?Item=N82E16814127501&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&AID=10446076&PID=3899435&SID=skim1402X558040
that his price id 280 $, where i live this will cost me 450$
so i am think going with the HD 5850 1GB ddr5 with the price of 1500 IS (395$)
we are in the list of the 5 highest taxes country's in the world