It's between the below cards, based on the deal currecntly available with the game 
Not sure if the £30 extra will be better in my pocket or not so i have a few questions.
http://www.overclockers.co.uk/showproduct.php?prodid=GX-065-HS&tool=3
or
http://www.overclockers.co.uk/showproduct.php?prodid=GX-066-HS
Is the cooler better on the X2?
Will the X2 overclock better?
Do you think it would be worth spending the extra and get the 7970 or wont i see much difference @ 1080p on a 24" screen?

Not sure if the £30 extra will be better in my pocket or not so i have a few questions.
http://www.overclockers.co.uk/showproduct.php?prodid=GX-065-HS&tool=3
or
http://www.overclockers.co.uk/showproduct.php?prodid=GX-066-HS
Is the cooler better on the X2?
Will the X2 overclock better?
Do you think it would be worth spending the extra and get the 7970 or wont i see much difference @ 1080p on a 24" screen?