Needed help over here ..!

ASLAM u ALIKUM ! I wanna buy a new graphics card . My budget is 6500 . My PC specs are : MB dg31pr , RAM 2.5 gigs , PROCESSOR 2.5 ghz dual core , POWER SUPPLY Vento 350 P.S.U .

I think Nvidea 9 series (9500GT) is perfect for me . Can any one tell me that 9500GT should be bought in 512mb or 1024mb ? (I have noted that MEMORY SPEED of 512 is greater than 1024 ... the speed of 512 is 1000mhz while the speed of 1024mb is 800mhz) ... PLZ give me a brief description .. Any help would be greatly APPRECIATED

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