Really, what are you asking here ? What kind of watercooling setup ? Do you know what you want ? Reseller ratings are available, use google. Read the forums. Would like to help you but dont know what you want and you can "google" just as easy as I can.
I recommend Danger Den, good stuff and good service in my experiences with them.
I like buying from Sharka as I find them to be able to provide multi manufacturer solutions as opposed to places like the Swiftech or Danger Den stores.