I am also thinking of getting the AquaComputer High End Kit.
I have an E6600 @ 3.2 (355*9, stock Vcore), cooled with a Tuniq Tower 120, my temps are:
idle
Asus Probe 26-28c
CoreTemp 40-42c
load
Asus Probe 38-40c
CoreTemp 50-53c
P5W DH Deluxe & Tuniq Tower 120 @ 1650rpm.
Will the AquaComputer water setup better my current temps?? and if so by how much more?