The Asus model has a nice balance between performance and noise:http://www.anandtech.com/show/4002/amd-radeon-hd-6850-overclocking-roundup-asus-xfx-msi
"And that leaves us with the Asus EAH6850. Asus’s design philosophy is normally what we’d call “aggressive”, as we have seen a number of their cards that trade temperature for noise, similar to the XFX. But this isn’t the case for the EAH6850 – it’s as balanced a card as we could ask for. It does well enough at cooling while approaching whisper-quiet noise levels, and even overclocked it manages to keep the 6850 in check without getting too loud or drawing more power than is necessary."