GPU: Geforce 6800 ULTRA with Ultra-speeds (Thanks to Aquamac ), I removed the original cooler from nvidia an put a thermaltake cooler on it. The card is now 15-20°C cooler and only 16dba loud.
ADDITIONALl: 2x 17" Apple Studio Display, Harman/Kardon Sound Sticks II
COOLING: I removed the 120mm fan and the 80mm fan in the PSU and put 17dba fans from NOCTUA on their place. I also added 2x 80mm NOCTUA fans on the top of my QS and one 80mm on the CPU heatsink. Now my QS is really cool.
The only things I need are 2 decorative grills for the top ;D