If you've been involved in any way in PC watercooling in the past few years, then you've probably heard of Danger Den... sad to see them go. I went with EK the last time I bought a waterblock, but I've bought plenty of their stuff over the years. In fact, I still have one of their blocks cooling my 5870. 
http://www.bit-tech.net/news/hardware/2012/11/01/dangerden-to-cease-trading/1
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