PC Power and Cooling makes awesome power supplies. Corsair and OCZ are good as well. I would really recommend going with a PSU from these manufactures with the most wattage and PCIe connectors that you can afford. This will give you the option to run multiple GPU's if you desire, and will give you a good safety margin for the power needs of your computer as the electrical components degrade over time and require more power.

Many thanks Word Not Allowed much appreciated. I am looking at the 480 but I am concerned about the noise and heat issues which are widely reported.Doies anyone know what the Power supply should be ?Best Wishes and thank you very muchChris EGBB

No heat or noise issues with my GTX 480, I think a lot of the noise/heat complaints are exaggerated.

Many thanks Word Not Allowed and audioman much appreciated. Going for the 750 PSU will let you knwo how I get on.Best RegardsChris