Asetek KT12-L30A is the best beginners kit, and has fantastic cooling performance., have a look here:
<A HREF="http://www.waterchill.com/" target="_new">http://www.waterchill.com/</A>
In the UK you can buy em here:
<A HREF="http://www.overclockers.co.uk" target="_new">http://www.overclockers.co.uk</A>