The link in my first post tells you what is recommended for any graphics setup you can imagine. The figures includes the entire system
not just the graphic card. This list was put together by the guys at RealHardTechX. They also maintain the number 1 power supply database on the internet. Anything you ever wanted to know about any power supply including who made it and links to any real reviews.http://www.realhardtechx.com/index_archivos/Page541.htm
Just ignore the Best Buy moron. As I said above if he knew crap about computers he would not be working at Best Buy.