A heads up regarding Indigo Extreme.
If you lap both CPU and your heatsink / waterblock, make sure not to mount it too tightly before you re-flow.
I lapped both. Couldn't do the re-flow using the first set, so had to remove it and throw it away. Carefully applied the second one, same thing.
Good I was smart enough to loosen the screws of my Megashadow. It finally managed to re-flow properly, thank God.