That corsair cx 600 will be plenty for your system!
Or even this
http://overclockers.co.uk/showproduct.php?prodid=CA-118-CS
I would personally advise against the Builder series. They are fairly expensive for what you get. The quality of the products is lower than most similar costed ones and it is not modular. A PC P&C 500W Modular for a similar price would be my option.