I'd wait till you get the card. See how hot it runs (For yourself) and whether or not you can tolerate the fan noise.
I have no clue about ATi cards but the 88GTS 512 and my GTX260 have achieved great overclocks on stock cooling, and the fan isn't even loud.
I have no clue about ATi cards but the 88GTS 512 and my GTX260 have achieved great overclocks on stock cooling, and the fan isn't even loud.