CPU Cooler

[Casterina]

I'm going for the i5 3570K CPU, I've £40 to spend on a good CPU cooler which will reduce the heat of the CPU as I want to overclock the CPU

 

[Casterina]

What's the difference between these two?

http://www.overclockers.co.uk/showproduct.php?prodid=HS-095-TR

http://www.overclockers.co.uk/showproduct.php?prodid=HS-082-TR