For those that don't mind dealing with Pixmania, and regret missing the pre-order price for a MSI 5850 at Overclockers in December.
I personally am going to wait for a reputable UK based company to start matching these prices.
Something to check is the physical dimensions of the card. I've not been able to find this out as Sapphire website is very stingy with specification information.
if you wanted to pay a little less then look at the Sapphire 5830 or Sapphire 6850 both on the same site.