Personally, dont go for the thermaltake or the globelwin, do what dod says and get enthusiast level kit from ebay or get the entry level Asetek waterchill, it is very easy and has nothing but rave reveiws.
www.overclockers.co.uk do all the Asetek gear and their entry level kit is £70! check it out @
http://www.overclockers.co.uk/acatal...r_Cooling.html
Asetek are also great at after sales. Ill be writing a reveiw of their service soon.