Aqua-computer.de:
Aqua-computer.de show off their newest watercooling block and the sight is impressive to say the least. I guess the old saying of "German Engineering" holds true even for water coolers like the Cuplex Evo. Overclex.net has a review of the very same water cooler right here.

If making your own water cooling out of big copper pipes appeals to you then you should really have a look at what this fellow went through to make his cooling system. "The evaporator must be submerged into the flowing liquid. The easiest method is to just submerge the coil into a coolant container. I chose not to do so, but to put the coil into a larger pipe equipped with coolant in/out nipples. This allows me to use the heat exchanger as an inline fluid cooler. This is useful during experimenting, and the heat exchanger can serve as a direct replacement for the standard radiator used in my current watercooling system."

Condensation Problem Solving: Another article on the same site talks about one way to remove condensation from the equation , and is pretty simple to say the least; "It is almost impossible to insulate everything in touch with the cold circulating liquid. A better method would be to prevent condensation altogether. This can be done by submerging the mainboard into oil, or removing all the moisture in the air inside the computer case."