I have this exact case, and I wanted silence too
get a Baybus (fan controller) it will change your life
Mine is a Zalman ZM MFC1-Plus.
It has room for 6 fans , maximum 6 or 7 Watts each. the 18cm fans from the bottom are 5,5 Watts, so it's good

I have 2 x passive 6850 's in crossfire too
if you are affraid abouts the temps
after 30 min of OCCT GPU+CPU (much more stressfull than a game)
CPU : around 60C
GPUs : around 90C
I could probably drop the temperature of the gpus in full charge by adding a 120 Mn on their side, and/or make the others fan turn faster, but in real use in games the cards barely reaches 70C, so it's good for me
So, it is silent ? well the noiser stuff inside are my HDD's (spinpoint F1's 1TB x2), so yeah it's pretty silent

here are some pics



Edited by neojack - 2/4/12 at 5:20pm