I would recommend Zalman fans. I got one similar to that for my CPU cooler (model #
CNPS7700-Cu). Very good build quality, does exactly what it says on the box and keeps things nice `n' cool. Plus it's very very quiet.
ATM I'm using a Artic cooler for my VGA cooler, one silimar to this
one, which I'm also very happy with. But for my next graphics card I will be getting a suitable Zalman cooler for it, as they just edge it in my book.