If you've not purchased anything yet and you can stretch to it, this might be worthwhile instead of that current GPU as the price is an absolute steal and should cover you for a few years if you do decide to play slightly more intense games:
http://www.overclockers.co.uk/showproduct.php?prodid=GX-258-SP
http://www.overclockers.co.uk/showproduct.php?prodid=GX-258-SP