http://www.overclockers.co.uk/showproduct.php?prodid=CA-018-SS&groupid=701&catid=123&subcat=
Hands down the best for the price.
Thanks all, looks like I may be spending the money on an SSD or something instead. Bit confused by people saying ditch the 5850 for a 7850, they're about the same @ equal clocks from what I can see.