the most important single thing to keep cool when overclocking is your cpu.so today i have put together a simple cpu only watercooling system for less than 150$ (this is configuired in U.S. dollars)
ok lets get started here we have the very popular,and excellent
maze4 cpu cooling block.
next we have an excellent,and not to costly pump the
Danger Den MAG II - LE 
the next item on the list is a
fill port resovoir 
and lastly we have the
black ice pro radiator 
the combination of these parts would give stellar cooling for just a cpu.all of these parts can be ordered with either 3/8",or 1/2" inch fittings.so just add the appropriate sized hose which is cheap,and any needed fittings like for that fill port resovoir.be sure to get some good cooling fluid,or use distilled water.
for less than 150$ you get stellar cooling,and the reliability of one of the best water cooler makers
Danger Den.
Thats within my price range $150.00 USD = £75 GBP and would be great for overclocking, worth thinking about ! thanks for the info pharoah , X
