AMD's latest generation of graphics cards, Not only an amazing price but factory overclocked too!
Mid-range not fast enuogh for ya? Buy 2, for £264 you will have a set-up faster than any single card money can buy (eg £500!!)
It is a pre-order but Scan are usually very good at getting stock in but the price normally goes up when in stock.
Reviews for you non-believers!! http://www.techpowerup.com/reviews/ATI/Radeon_HD_6850_CrossFire/23.html
Also, bare in mind that is standard stock speed results so you can add another good few percent onto those scores.
As for other cards at or around this price, i have nothing bad to say about them, this MSI card is meant to have a better PCB layout, is much small than standard card and a better, quieter cooler.
But basically any 6850 at or around the £130 mark is a fantastic deal.
Also look at this:http://www.hotukdeals.com/deals/msi-radeon-5850-1gb-gddr5-with-twin/833791