Looks promising, are you going to use a fast flow of water for this system? I know that there was some one here that was using a normal watercooling system and put a heatsink and fan on top of the copper waterblock as a fail safe if he forgot to turn off the pump or the pump failed. Well he did and his temps ended up being 6c lower than without the waterbock between the cpu and hsf. The only suggestion is that you have the fan on the rad sucking air from the rad, because most get an increase in transfer and the hot air wont be pushed on the waterblock underit.