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Whats your budget?
Two of these in crossfire?£400 and also I am running a stock cpu cooler so whats a good looking cpu cooler which performs well so my window can look nice

Two of these in crossfire?
http://www.overclockers.co.uk/showproduct.php?prodid=GX-004-HS&groupid=701&catid=56&subcat=411
As for CPU cooler, it depends of your preference and budget.
I've got a 2.5k budget but i'm planning on making a complete new build soon just waiting for the new cpu's to come out so i'm just making use of my 5 year old pc.