I wonder if mounting a small (50mm) fan to the front of the brain as well as one on the air flow outlet would help to reduce internal temperature enough to cause the noisy built in fan to turn on less frequently and/or less intensely.
Rasurbo makes a pretty high volume and relatively quiet fan.
These external fans could be controlled with a "Zalman Fan Mate 2 Speed Controller" (or some other higher quality one) thus finding their sweet point between air flow capacity and noise. Heck, it would be easy enough to try.
We were just getting ready to take the plunge and buy our first Epic three days ago but then read about this overheating problem, so will have to hold off for now. I am so sad. (Maybe should go with a Red One..... )
Here is the link to the fans:
http://www.rasurbo.com/RASURBO 2011 eng/50mm.html