I'd check out performance-pcs.com
Since they are the largest and most comprehensive water cooling retailer that I currently know of other than the recently deceased Frozen CPU,
R.I.P to that retailer many of us enthusiasts morn its lose, and while its still possible to visit there site they havent been able to take any orders since February of this year.
If you are interested in shopping local I'd check out XSPC
http://www.xs-pc.com
A UK based water cooling company, a very solid company indeed and one I'm using exclusively for all Major Components in my $8,000+ Overkill Build seen here
http://pcpartpicker.com/p/rMwtdC
Another European Company I'd check out is Alphacool
www.alphacool.com/index.php?language=en
A German Based Company with one of the most Solid Reputations in the Water Cooling Business. With A Fantastic Array of products its kinda hard not to find what your looking for.
Or if u fancy a Industrial Look try out EK
http://www.ekwb.com
Known for High End Custom Components, many enthusiasts like me go there when the others fail to meet are increasing demand for pure perfection.
Anyway Hope This Helps
If you'd like any other helfhelpful advise shoot me a message.
Sincerely,
Guyshen Takeru