Set of these will be fine:
http://www.overclockers.co.uk/showproduct.php?prodid=MY-203-CS&groupid=701&catid=8&subcat=1517
Personal view would be change the cpu to one of these:
http://www.overclockers.co.uk/showproduct.php?prodid=CP-339-IN&groupid=701&catid=6&subcat=1672
Or go i7 950 with a X58 board and triple channel memory.