here is a review with a TRUE Black against water cooling
It's beautiful, but I can't imagine it would touch anything close to good water, and at over $100 you are 3/4 the way to a decent custom WC set up.
Remember the TRUE copper is more than double the weight of the TRUE Black and runs about 6 to 8 degrees cooler than the TRUE Black. I do realize the water kit in this review is not a super high end model but a high end setup would be even more money then a True copper. Having said all this the TRUE copper is way way to heavy. More than twice the weight of a TRUE Black.
http://www.bjorn3d.com/read.php?cID=1372&pageID=5481
Since the release of Ultra-120 eXtreme, it has become the standard, or as the one to beat in a lot of major CPU cooler comparisons. At Computex 2008, Thermalright displayed three versions of the Ultra-120 eXtreme; original (aluminum), black, and copper. Not surprisingly, the copper version was the one most well received. Many hardcore Overclockers saw it to be the ultimate air cooling device. Inheriting from its predecessor, TRUE Copper has six highly efficient heatpipes with every vital part soldered to them to ensure the highest rate of heat transfer and durability. This is one of the features that you will see in each and every Thermalright heatsink.
TRUE Copper’s weight exceeds all of our previous heatsinks. Due to this reason, we strongly suggest installing it on a horizontal platform. Even though in our test lab, TRUE Copper was taken out for a test drive on a vertical platform and ran without a glitch as the motherboard came out unscathed. But since not all motherboards are manufactured the same way in terms of thickness and degree of stress, Thermalright cannot guarantee the condition of your motherboard after TRUE Copper is installed for a certainly amount of time. If you insist installing on a vertical platform, please check to make sure your motherboard is sturdy enough. As most experts would expect, TRUE Copper will be a limited edition to the eXtreme lineup due to the high cost of copper. If you pass up this chance, you may never see another TRUE work of art again so don’t wait anymore and grab one for the collection.