Just wondering what everyones experiences are with the fan noises of graphics cards

I have 3 different types

A sapphire 5770 which is in my HTPC which is pretty quite (hence why it is in the HTPC)

An Asus 5850 directCU which is very quite

and 3 XFX 5830 which are incredibly loud but are the most stable and clocks higher than the other cards without a voltage bump

Also any suggestions on quite ones as my wife wants me to build her a PC which I rekon I can put 2 cards in